Letting them die and rot there service an important purpose ~ they don't get to kill anyone else.
Then they should die. Not cost taxpayers millions to house them. Jail time is proven to not be an effective deterrent, and “[not getting] to kill anyone else,” is not best accomplished by this waste of human life and money. Other people have been slaving away for years to fund these prisoners, and that is never factored in.
Very good point.