It's the second time rape is evoqued in two days, so i'll add my personnal anecdote. Both my parents were social workers, my mother as a psychologist, my dad as youth camp director (Not a summer youth camp, more like a permanent youth camp that help children (6-15) with difficulties manage their homework, organize football/basketball tournament after school...)). This line of work made them befriend a huge variety of people, especially a prison counselor and a judge specialized in minor protection.
Well, the discussions when they came home were "fun". One of those discussion was about a young man who raped a young girl. The judge said something like "it's the first time i felt guilt and compassion from a rapist". It was disturbing, so i asked her to tell me a little more than this, and she told me that at most, rapists regrets being caught, regret "not being able to control themselves" but she can never feel sentiment over the victim except jealousy. The prison counselor and my mother agreed, and my mother even said that the boy might be either a really good faker, either an extreme case.
Later i learned that the boy had a schizophrenic episode and was send to a mental hospital rather than prison (as he should).
I have nothing to conclude this, but i do think personnally than most rapist should be on watch after a prosecution, and should be really costly. I don't think they can reform, and the only way second crime to be safe from them is to take them out of the society (aka long prison time).