Very simple: The 10 commandments are a great guide for life. We as a species are prone to mistakes, failures and violence through are tough processes.
Whether a person believes in God or not it is there choice, with that being said, as humans we should not group people nor prematurely judge people by looks, race or their life choices.
If we all treated each other as we would like to be treated we would not be were the world is today.
Tolerance and acceptance vs judgement and hate.