Y'know, reflecting on it, an unmentioned thing is that this is not a story about how revenge is bad. Revenge is taken against someone who has wronged you. Actual revenge would be understandable, if damnable. He didn't try to get the guy who raped his friend, he tried to goad a fight with someone who has nothing to do with the rapist other than skin color. There's no "revenge" here, there is ONLY racism, and the fact that he could frame it as such is a sign that, even if he's not so overtly unhinged in his behavior anymore, the dude still has not really unpacked this in any meaningful way for himself because he doesn't understand that the very fact that he could justify violence against some "black bastard" that had nothing to do with him AS revenge is some pretty intense racism.