"So you're saying people are only good out of fear? "

YES!

Fear of your parents, police, government and God

By the way, "Government" is made of people, who are inherently evil. When the government itself gets too powerful and isn't accountable to anyone, they immediately do bad things like said killings and bombings you mentioned. They pillage funds and make corrupt choices.

The wild-wild-wild west era and medieval times were terrible times!! haha. People bonded together in clans in order to protect themselves from evil outsiders. It's where tribes, and society, really come from - protection from those outside that group. It's a self preservation measure.