Yeah I mean they eat humans we gotta thank that guy for bullying Pierrot cuz if he didn't we wouldn't have a story and we'd be eaten XD
well to be fair, humans haved treated them pretty terribly too. I’d kind of imagine they think eating humans is fair game considering they’ve seen humans can be monsters too. Basically the MC (and the boss) are the only genuinely decent people, but even in MC’s case that could be debatable depending on how the story goes.