Because that’s the fantasy of a lot of men.
It's very weird to do it in a virtual reality, though, where the victim cannot actually feel what's happening, but neither can the perps. They couldn't feel the sensations, so clearly the fantasy isn't even about the sexual sensations, it's about terrifying and humiliating someone. And knowing someone is attacking you just because the act of horrifying you is what's actually giving the attacker pleasure is just so disturbing to anyone's view of human nature. It's a up-close look at pure sadism.