I frankly never understood Japan and their hypocritical bullshit. I'm not saying Ritsu should have gone out of his way to kill the guy, but if an opportunity presents itself where the would-be-MURDERER, WHO UP TO THIS POINT WAS STILL TRYING TO KILL THE MC kicks the bucket instead, I see no logical, emotional and or psychological reason to help. The kick to the nuts is the: " oh hey, you tried to kill me over a ring but since I didn't die, let's be friends instead!" garbage.
Hah, I really miss the days of Kore Wa Zombie Desu Ka? Campione! Grisaia series etc. Hell, a parody like KonoSuba does better rom-com than 99% of the stuff that gets released nowadays.