Ya think??
Murder for hire can be a very lucrative profession when you know you won't be arrested and prosecuted for your crimes.
The old Murder Incorporated outfit in 1940's era NYC never had it nearly so good as today's gang of hired killers. They were actually punished by the law for murdering people.
Funny story: One of the Murder Incorporated guys (I think it was the head of the group) got a new cellmate during WWII, a conscientious objector who had refused even to enter the service as a medic. The gangster asked him what he was in for. After hearing his story, he said, astonished, "You mean they put you in here for not killing people?"