Revenge was something gotten on our behalf, by someone else.

[Maybe he'd hoped for a measure of vengeance at some point, but all that mattered was that he was dead. Kakyoin was fine with not being the person to accomplish that; he wasn't going to hold on to spite until it twisted into bitter regret over the result not being reached by ideal means.]

I hope I'm wrong. I'd hate for any of my friends to hold on to something like that for so long--besides, I know we all carried hell of a lot more that wouldn't make for the most polite conversation.