This is where I'm torn. I've explained my concerns should we have a DP. Yet, these situations I believe happen too often. I'd prefer these beasts to be removed from circulation, e.g dead.
There's no reliable way of trusting any single system that we have though. That's the Police ( probably a fair few rapists, wife batterers, sociopaths), same for the medical profession and on and on.
We can't hand over full trust over life and death to any body with power.