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!
Thank you for reading my answer.
Hope you enjoyed it!