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That is a really good point about how if the sentence is huge then it makes it harder to get a jury to convict the person.
In addition, if a rape conviction carries a life sentence, there isn't any reason for a rapist to spare the life of his victim. Same goes for child molesters. If a molester knows that the prison time is the same whether he murders the child or not, why shouldn't he murder the prime witness?
I'd love to rid the earth of these criminals, but in our zeal we need to be careful we don't wind up with unintended, gruesome consequences.