While that's true, there are two sides to crime. Prevention and Punishment. One happens before, and the other happens after. People are generally fine with punishment. The prevention part is where we disagree. This then poses the question: how many of your children are you willing to sacrifice on the alter of anti-prevention?

So while a punishment might exist for something, that doesn't preclude trying to prevent the crime form occurring in the first place. This isn't easy work, and of course, it won't work 100% of the time, but it doesn't mean we stop trying to reduce the number.