We do such mean things to other people because,we assume to oftenly that we are higher than someone else.You know,as an old phrase once said,"You can't judge a book by it's covers".So,that's how it should be with each other.But,we're not.
Motivational note:
If you want to be non-harmful to people, be that peacemaker that everybody wants and loves.Trust me.It will pay off soon enough.Just give it time and keep hanging on in there.Keep calm,Stay strong!