I hate human beings how can I develop metta?

I don't like human beings because of their ego centric nature. They have destroyed nature- plants, species, morality, love, harmony etc. I just wish whole human species vanish or come to end. They have messed up the perfect nature. How can I develop love or Metta towards human beings? What are the ways by which I can develop love towards who are not doing such works to be loved?