This life

This life makes me sad. So much hate, destruction, and evil. In trying to be the change I want to see, so many knock me down. So many hurt me, mentally and physically. I will never understand it. What do people gain by hurting others? I could never hurt others for fun, personal gain, etc. So how do so many find enjoyment in it? How can we shape the world into something better when those wanting to do good are so few and those who want to hurt are so many?