Does anger have a purpose?

Yes.
Anger is a very active/action based emotion. It drives you to act at something.
It is also a protective emotion when someone is feeling helpless or fearful.
As long as anger is expressed in healthy ways, it's a beneficial emotion.

retribution

"[i]Holding on to anger is like drinking poison and expecting the other person to die.[/i]" - Buddha

Yes, when it is directed at the right things. For example, people should get angry when children are abused, when injustice exists, or when people are enslaved. If there is no anger, no one will be motivated to work for change.

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All emotions do, but anger is by far the most useless. Action without thought is dangerous and always a bad idea.

I think so. If we didn’t get angry about the way we or others are treated, no one would stand up for what’s rights.

*chucks a D cell battery, square at your forehead* I dunno.

Yes ...it makes you immune to others dumbassery

There is a survival aspect to anger.

https://rethinklife.today/the-biology-of-anger-101/

YES.

If it didn't, we wouldn't have evolved it. Even in first world society it can have a purpose if used carefully because it can increase perception and focus.

It does as long as it`s controlled.