Remember that capitalism was born around four hundred years ago, a time when violence was much more normal and acceptable than it is today.
Wow, from what you're saying apparently capitalism has drastically decreased the violence in the world. Thanks for sharing what capitalism means to you.
Reason and ethics have compelled our civilization to beome less violent
in spite of capitalism, the nation-state, and religion. Not because of them.
Then maybe we could be lucky enough to have some examples where people got rid of capitalism, the nation-state, and religion. Any examples come to mind? Ringing any bells? Can you think of a time where people overthrew their government and established a society free of religion and capitalism?
North Korea, the USSR, Cuba, China? Did any of those experience a decrease in violence when they eliminated your main culprits?