Killing an animal for food is nothing like rape. Rape is unnecessary and not required for sustenance or reproduction, it's not something our species evolved to do (the fact that something can be done doesn't mean we evolved to do it, ducks on the other hand...). Are you equivocating most of the world's population for all of history with rapists? Is your mom and dad a rapist then? Are lions rapists, just not smart enough to know they're raping gazelles and zebras?
If you think animals killing and eating other animals is rape, then I hope you're a blade of grass because even vegans would be unintentionally raping animals in pursuit of sustenance. Don't kid yourself that a vegan diet is free of suffering, you just care less about those species apparently.