The person who says, “I can’t help how I feel,” is lying to themselves.
I suspect they do this because anger is better than boredom.

People who stay angry about politics need to read a history book.?
People who stay angry at their relatives need to lower their expectations.?
People who stay angry at their circumstances need to read the book of Ecclesiastes.

Shit happens. Life goes on. We need context. We need perspective.

I find these in literature and the arts. You may find them where you will.