Sadly Alan all that would lead to is more of the ****wits being bred into this world and we have enough of em already past and present. It would be a good moral booster in prison albeit the idea of being there is to TRY and rehabilitate them for their wrong doings but we all know today that is bollox and they should left to rot or put up against a wall and shot or hung in public. I would volunteer as the hangman/shooter and i would not wear a mask either. I would want folk to know that it would be me who would be putting them down if they committed such a crime.
The other option would be to find 2 x deserted islands in the middle of shark infested ocean miles apart and put all the males on one and females on the other so they cannot pro create and put anti submarine nets around the islands with water mines and lots of sharks and crocs and other nasty sea life so they cannot escape and once a month a RAF Chinnook hovers overhead and drops a pile of all the out of date food from supermarkets and a few bags of seeds to grow veg with and leave them too it FOREVER. Now that would be a deterrant would it not??