I'd be worried if the ability to live as a person wishes is removed in anyway.
Sure, people shouldn't live as criminals and we all wish they didn't exist, but having the ability to make that choice taken away would be a scary prospect.
Yes, I'm not suggesting it's a good idea, just that I can see things going that way. There are so many illnesses and conditions being discovered/acknowledged all the time, that I wonder where it will stop.
If you are talking about the UK, sort out the alcohol/drug problem and you will probably eradicate 70%+ of the crimes. So yes, people can be treated...before a crime is even committed.