What is the Minimum Duty of a Decent Person?

I'm referring to what a person who would characterize themselves as moral would believe is the very least that he owes to his society.

If he is in a group, and some of them begin playing "He deserves it" pile-on towards one of the group, do you step up, and point out that they are being abusive and bullying towards that person? Do you point out that the person maintaining civil interactions should receive an apology? That their mud-slinging insults were unworthy of an adult?

Or do you just try to stop the interactions entirely, asking for "everyone to stop arguing"?  Are you satisfied to simply get the active fighting to end?

The thing is, though, as long as the bullies aren't called out on their abusive ways, they will continue to use those tactics. By simply shutting down the fight, you haven't stopped the ill-feeling:

• On one side, there are people who feel entitled to insult, berate, and slander their opposition. And, that defending the object of their assault makes you a valid target for the next round of attack.
• On the other hand, there is the person who was attacked, who is due an apology (at a minimum), but, thanks to your acceptance of a cease-fire, won't get it. He will be urged to "make friends", despite them having insulted him and abused him.

Neither side will thank you. They will be primed to re-start the fight later, and you can bet you won't be invited to the show.

Those who call themselves "peacekeepers" are the most likely to want to end the fight without a true resolution. They fail to see that the issue is NOT the differences that have erupted into a head-to-head discussion, but that both sides were not conducting themselves equally. Ground rules have to be established, AND ENFORCED EQUALLY FOR ALL PARTICIPANTS. 

1. No personal insults. No name-calling. No slander.
2. One topic at a time. Keep to that topic until both sides have agreed that they have reached the end of it, or until one side quits the discussion.
3. One on One - all others must sit down and SHUT UP!
4. Those not debating must act decorously; failure to do so means immediate ejection, and banishment from the forum/group for a time.

That's a minimum. The very least that an American citizen has to expect from any forum, whether public or private, government or otherwise. Larry Correia lays it all out here.