I would be a gazillionaire if I could figure out a way to legally monitor predators.
Some do go home, but it depends on the person’s situation. If a stalker goes to prison, that does not guarantee a victim’s safety. They can still stalk from prison. If a bus hits a stalker, and they are off to the great beyond. Life can return to normal.
In reality, I believe it is best to assume the predator is one step behind. Therefore, one does no become complacent. Also, quiet does not mean all is good.