The perps are not punished.
Exodus 21
12 “He who strikes a man so that he dies shall surely be put to death. 13 However, if he did not lie in wait, but God delivered him into his hand, then I will appoint for you a place where he may flee.
14 “But if a man acts with premeditation against his neighbor, to kill him by treachery, you shall take him from My altar, that he may die.
16 “He who kidnaps a man and sells him, or if he is found in his hand, shall surely be put to death.
Exodus 22
25 “But if a man finds a betrothed young woman in the countryside, and the man forces her and lies with her, then only the man who lay with her shall die.
Deuteronomy 17
11 According to the sentence of the law in which they instruct you, according to the judgment which they tell you, you shall do; you shall not turn aside to the right hand or to the left from the sentence which they pronounce upon you. 12 Now the man who acts presumptuously and will not heed the priest who stands to minister there before the Lord your God, or the judge, that man shall die. So you shall put away the evil from Israel. 13 And all the people shall hear and fear, and no longer act presumptuously.
Now, there are things in the law that are about Israel's relations with God, along with the law about how we are to treat each other. This is why Moses says the Priest and the Judge.
The death penalty is a deterent. America is not getting it done like they should. James Holmes is still breathing air.