Board Thread:General Discussion/@comment-34020894-20180820224530/@comment-34871600-20180908190548

Maybe they were suffering from abuse. One hint may be when you check the faded ribbon:

If you're cuter, monsters won't hit you as hard.

That may imply Chara was abused by humans, and that's what caused them to hate the humans in their village.

People may say Chara was abused by their parents, but the faded ribbon description may imply chara was abused by everyone in their village.