Why do people HATE instead of LOVE?!

This world is full of so much HATRED!! The news of Norway being bombed yesterday saddens my heart, among all the many other acts of crime that happens every day.... Why can't people LOVE one another like the Bible instructs us to do. Growing up, I don't ever remember hearing of so much hatred... I think the world has gotten worse in the last 15 years. I guess we'll never have peace until God returns...