Because it's a lot of fun. Just because you are a character doesn't mean you have character. They're filthy animals. I don't eat filthy animals. Sausages taste good.
Pork chops taste good.
A sewer rat may taste like pumpkin pie. I'll never know 'cause even if it did, I wouldn't eat the filthy motherfucker. Pigs sleep and root in shit. That's a filthy animal. Dogs eat their own faeces.