How people can be hateful to others because of what their skin colour is, what their sex is, or because they have a disability. In the grand scheme of things our lives are short, so why not spend that time on loving people rather than hating them for things beyond their control which harms no one?
The worst discrimination I've experienced was by the religious finding out I'm atheist. It's mind blowing how nasty people can get when they perceive you as an "other" without reason.
It makes a lot more sense when you realize how many people literally don't have empathy. It's like they're missing a crucial brain function necessary to being a part of a functioning society
I agree, I believe that people fundamentally tend towards peace in the absence of any other forces, and this is something that makes no sense to me aside from the ideas being planted and nurtured in our society to keep us divided and lashing out at each other instead of looking up and rising against those who oppress us.