Take them within inches of death, allow recovery, and start all over again..
21 times at least, once per victim, with an equivalent amount of torture
each 'session'.
The county that would do that, would probably get attacked by the humanitarian types :gun:
They'd get praise for it also.
Seriously, if you have a system where two guys do not consider that doing illegal activities is actually wrong, then the system is f***ed up.
It's wrong to think they assumed that they wouldn't be caught. Ofcourse they knew they were going to get caught sooner or later, problem is the correctly assumed that they'd just spend the rest of the days in a government payed hotel, doing exactly nothing.
So essentually, punishment is not exactly punishment. They were effectively removed from society, but that's healing, not preventing.
If you were to have a system where, instead of
"I'm going to kill people until I get caught, when that happens I'm just going to make the most of my time somehow"
you'd get a train of thought more like
"If I hurt some people now, and if I get caught, they'll do equally terrible things to me. Is it worth it?"
...I believe things would be a LOT different.
If some idiot does not value somebody else's life, at least he would value his own. Taking away the element of security after being caught would make everybody re-think.