Our role is the same as the messagers of 5 & 6

Fifth: Correcting Misguidance and Corruption in the Life of the People
When people live in ignorant societies that are not ruled by the Deen of Allaah and are not guided by the legislation of Allaah Subhaanahu wa Ta`aala, their societies get corrupted, and this corruption reaches the depth of their dealings. So, it is a must that someone reforms these societies and makes them live according to the Deen of Allaah the Almighty.
Allaah Subhaanahu wa Ta`aala made this difficult task from the tasks of the great messengers, that they uprooted corruption that spread in the societies and fought it because it is a transgression and oppression. So, every messenger that Allaah sent used to call his people to follow the straight path, the path of Allaah Subhaanahu wa Ta`aala. And to clarify it to them and guide them to it. This is common among all the messengers; their first slogan was, "O’ People submit yourself to Allaah only, surely you don’t have a Lord other than him."
After this call and based on it, we find every messenger uprooting all kinds of corruption in his society.
We see the Prophet Hood (Hud)`alayhissalaam denying his people the arrogance on the earth and oppression. So, Allaah Subhaanahu wa Ta`aala said in Soorat Ash-Shu’araa, (Verses 128-131) that Hood`alayhissalaam said, what can be translated as, "Do you build high palaces on ever high place, while you do not live in them? And do you get for yourselves palaces as if you will live therein forever. And when you seize, you seize as tyrants. Now fear Allaah, keep your duty to Him, and obey me."
We see the Prophet Saalih`alayhissalaa m denying his people the corruption on the earth and following those who do mischief. So, Allaah Subhaanahu wa Ta`aala said in Soorat Al-Araf, (Verse 74), what Saleeh said to his people, what can be translated as, "…So remember the graces from Allaah, and do not go about making mischief on the earth." And Allaah Subhaanahu wa Ta`aala also says in Soorat Ash-Shu’araa, (Verses 150-153), what can be translated as, "So fear Allaah, keep you duty to Him, and obey me. And do not obey the command of Al-Musrifen (i.e. their chiefs, leaders who were polytheists, criminals and sinners against the law of Allaah). Who make mischief in the land, and do not reform.
We see the Prophet Loot (Lot)`alayhissalaam denying his people the despicable act of homosexuality that spread among them. So, He Subhaanahu wa Ta`aala said about this story in Soorat Al-Ara’f, (Verses 80-81), what can be translated as, "And (remember) Loot when he said to his people: "Do you commit the worst sin such as none preceding your has committed in the Alameen (mankind and jinn)? Verily, you practice you lusts on men instead of women. Nay, but you are a people transgressing beyond bounds (by committing great sins.)." Also Allaah Subhaanahu wa Ta`aala says in Soorat Al-Ankaboot, (Verse 29), what can be translated as, "Verily, you perform sodomy with men, and rob the wayfarer (travelers etc.)! And practice Al-Munkar in your club…"
We see the Prophet Shu'ayb`alayhissala am denying his people the crime of cheating when using the weight scale. So, Allaah Subhaanahu wa Ta`aala said in Soorat Ash-Shu’araa, (Verses 181-183), what Shu’ayb`alayhissalaa m said to his people, what can be translates as, "Give full measure, and cause no loss (to others). And weigh with the true and straight balance. And do not defraud the people by reducing their things, nor do evil, making corruption and mischief in the earth."
We see the Prophet Muhammad sall Allaahu`alayhi wa sallam denying his people the crime of killing innocent children, and legislating for themselves what Allaah Subhaanahu wa Ta`aala has not permitted. Allaah Subhaanahu wa Ta`aala says in Soorat Al-An’am, (Verse 140), what can be translated as, "Indeed lost are they who have killed their children, from folly, without knowledge, and have forbidden that which Allaah has provided for them, inventing a lie against Allaah. They have indeed gone astray and were not guided." He, Subhaanahu wa Ta`aala also says to them in Soorat Al-Maa`idah, (Verse 103), what can be translated as, "Allaah has not instituted things like Bahira (a she-camel whose milk was spared for the idols and nobody was allowed to milk it) or a Sa’iba (a she-camel let loose for free pasture for their false gods), or a Wasila (a she-camel set free for idols because it has given birth to a she-camel at its first delivery and then again gives birth to a she-camel with its second delivery) or a Haam (a stallion-camel freed from work for their idols, after it had finished a number of copulations assigned for it, all these animals were liberated in honor of idols as practiced by pagan Arabs in Pre-Islamic times). But those who disbelieve invent lies against Allaah, and most of them have no understanding. "
The sixth task is to run our affairs as Muslims according to the laws of Allaah
If the people accept and embrace the message of the messengers, they become one Jama’aah (group of people) and this Jama’aah progress and develop to become an Ummah, and this Ummah needs someone who can run its affairs and lead it. The great messengers were the ones who took on this great responsibility and ruled the people with the rules of Allaah Subhaanahu wa Ta`aala and His legislations. Allaah Subhaanahu wa Ta`aala says in Soorat Al-Baqarah (Verse 213), what can be translated as, "Mankind was one Ummah (nation) and Allaah sent Prophets with glad tidings and warnings, and with them He sent the Scripture in truth to judge between people in matters wherein they differed…"
Allaah Subhaanahu wa Ta`aala proclaims the mission of the Prophet Dawood (David)`alayhissala am on earth, so he said in Soorat Saad, (Verse 26), what can be translated as, "O’ David! Verily! We have placed you as Khaleefah (a successor) on earth, so judge between people in truth and do not follow the desire - for it will mislead you from the Path of Allaah…"
The Prophets of the children of Israel used to rule their people with the Torah. The Prophet Muhammad sall Allaahu`alayhi wa sallam says in a Hadeeth reported by Imaam Bukhaari, Muslim and others, "The children of Israel used to be ruled by the prophets; when a prophet perished, another prophet arose (to rule them)." Allaah Subhaanahu wa Ta`aala speaks about this in Soorat Al-Maa`idah, (Verse 44), what can be translated as, "Verily, We did send down the Torah (to Moses), therein was guidance and light, by which the prophets, who submitted themselves to Allaah’s Will, ruled the Jews. And the rabbis and the priests (too ruled the Jews by the Torah after those prophets) for to them was entrusted the protection of Allaah’s Book." Allaah Subhaanahu wa Ta`aala also says about the Christians; the people of Injeel in the same Soorah in (Verse 47), what can be translated as, “Let the People of the Gospel rule by what Allaah has revealed therein. And whosoever does not rule by what Allaah has revealed (then) such (people) are the Fasiqoon (disobedient) .”
Then, Allaah Subhaanahu wa Ta`aala says to the Prophet Muhammad sall Allaahu`alayhi wa sallam in the same Soorah, (Verse 48), what can be translated as "And We have sent down to you (O Muhammad) the Book (this Qur`aan) in truth, confirming the Scripture that came before it and Mohayminan (trustworthy in highness) over it (old Scriptures). So judge between them by what Allaah has revealed, and do not follow their vain desires, diverging away from that which has come to you…" He also says to the Prophet sall Allaahu`alayhi wa sallam, in Soorat An-Nisaa’, (Verse 105), what can be translated as "Surely, We have sent down to you (O’ Muhammad) the Book (this Qur`aan) in truth that you might judge between people by that which Allaah Subhaanahu wa Ta`aala has shown you…"
Finally, we summarize that our role today is the same as the role of the blessed messengers of Allaah Subhaanahu wa Ta`aala, because we are their successors till the day of judgment:
First - conveying the message of Islam in the clearest way.
Second - calling all people to Allaah Subhaanahu wa Ta`aala.
Third - giving glad tidings and warnings, which were given to us by Allaah.
Fourth - reforming and purifying the souls of the people.
Fifth - correcting misguidance and corruption in the life of the people.
Sixth - is to run our affairs as Muslims according to the laws of Allaah.