This is great
I'll do my boomer-telling-his-life-in-comments-of-a-rock-music-on-youtube moment:
My grandpa avenged our family by killing a wrongdoer to us.
He wasn't pursued or trialed for this, but he lived a life full of guilt due to this event, despite the wrongdoer being unredeemable.
Breaking the chain of revenge is comforting in theory but hardly satisfying in reality.