Same reason we get a boner from rape or bdsm, violence is pleasing to the human mind its why we go to action movies and enjoy watching hundreds of people die whilst eating popcorn.
Except we don't.
Nearly all media that is made for the 'good feels', that has violence, isn't using the violence ITSELF for it. It is depicting the protagonist's agency. It is showing a character that the audience is identifying with using 'power' against the 'enemy'.
MOST people are repulsed by violence for violence sake. Sometimes this revulsion is due to us imagining ourselves being the victim of said acts. This often leads to thinking about our own mortality. Or imagining a permanent maiming injury.
But sometimes the thought of committing the violence is just as horrifying. Empathy is a bitch.
Violence for the sake of violence is used (almost) exclusively in the genre of horror. Because most people are revolted by it.
Second. Rape is about power not violence. Violence CAN be that application of power. But it does not need to be.
Third. BDSM is about trust. If you just see someone whipping someone else who is tied up, you are TOTALLY missing the mark.
If you enjoy violence, or are aroused by it, that's fine. I'm not going to kink shame anyone as long as they are being safe IRL. You do you.
But don't make the mistake of thinking that most people also like it. Because the overwhelming majority does not.
