Ad-homs do not improve the conversation.
> the consequences of rape is that the perpetrator got his jollies.
With the further consequence that the rapist has emotionally traumatized an innocent victim, and the still further consequence that the victim may demand justice. The point of punishment is not primarily to make the offender feel guilty. The point of punishment is to make the victim feel better.
Think of it transactionally. If I stole $50,000 from your grandma and got caught, you'd expect me to pay back the money, yes? Now say I beat your grandma with a stick because I thought it would be funny. As we're too civilized for the courts to have me beaten with a stick, instead I repay her emotional trauma with my own - through incarceration.
While your ethics might be different - you may think people should not bear the responsibility for their own actions - my ethics firmly hold that we are all accountable for our own decisions.