the girl's logic in a nutshell: I wanted to apologise (or not) so I deliberately kicked his balls to show how sincere my feeling was bc for some reason my violent act couldn't reach him at all, and now I want to investigate something so it's okay to trigger his ptsd bc a proof is more important...
well, kaneki got depressed knowing himself turning into ghoul, and even called touka monster, which strong enough to tell us that he despised ghoul kinds in the beginning