Go back and read my posts unless you're just trigger-happy. I have offered a number of effective alternatives and valid deterrents.
OK, just for you: effective incarceration itself is a deterrent. Valid reasons for incarceration include restraint (protection of society from dangerous criminals - the #1 job of government), restitution when possible, voluntary rehabilitation, forced productivity to pay for one's stay at the Big House, all of which can serve as added deterrents.
Out of the ball park on so many counts.