Rape is an act of violence where sex is the weapon. They meant to degrade and demean her and in this way be superior. It’s a common enough human trait and why God had to reestablish the Ten Commandments - people without God get increasingly depraved.
Yes, that clip where the guy can't stop laughing about her being "deader than OJ's wife" and other deceased people was beyond disgusting. While she's very probably in need of medical attention the guy's on camera unable to stop laughing about the degrading things done to her and her inability to do anything about it. He showed zero regard for her as a human being. She was nothing more than an object for use and abuse.
Nope.
Rapes is an evolutionary reproduction strategy, with sex and impregnation as the evolutionary pay-off for doing it, i.e., the rapist’s genes are rewarded for the act by being passed on down to the next generation.