back in early days , where're afraid of animals like lion, bear, tiger and any other predator that we know as a threat and we invented a tools as protection. and then another threat came which is a "human" where chaos and war is everywhere. And we inherited that fear, nowadays, we depends on government, but when the government abuses power, they exploit vulnerable people because of greed.Nowadays fear is no longer an instinct defense mechanism but rather a curse that gets you killed. :)