Dolphins rape other dolphins, monkeys tease and in a way "torture" each other.
There is such a thing as hate between animals as well. They inflict more damage to another more than is necessary for survival. Superiority and fear of the unknown, they have it too. Jealousy....
Hate works for humans as well, it's just more sophisticated, but the propaganda is aimed at our basic animal instincts. Someone wants to hurt us, someone wants to intrude on our space. This is how you get a whole nation to accept putting people in concentration camps. The vast majority doesn't do it because of pleasure but because propaganda has awakened their basic instincts of fear and thus hating someone. This is really not unique to humans.
I don't agree with this view that "humans are even worse than animals". That is just one step away from "they" are even worse than animals. All life should be respected, the complexity of it. You cannot pretend to respect certain species while speaking in contempt of the most complex one. Just my opinion

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