Why is there so much hate?

Someone says this on the Net on why there is so much hate:

"Because stupid people who are insecure about their own shortcomings think that their God is better everyone else's God, they believe hate is not only great but is also justified based on their religion, and cast their stones at me first, therefore, I must cast bigger stones because my love for my country demands it".

And no doubt people on the other side think along more or less the same line.

Perpetual hatred, guaranteed.