I hate him for what he did to my Earth when I was a little kid. He killed hundreds of the world's heroes starting first with my father because of how inspirational Captain America is. And after he killed them he took their costumes and weapons and displayed them in his fortress like trophies.
I'm not defending Ultron in any fashion. I just can understand his reasoning better as it's not born from hate like your HYDRA/Nazi friends or a desire to conquer.