Filling in the blank -- make them directly and tangibly experience (to truly understand) the effect of their crime (i.e., an attempt to build empathy in a psychopath who has none).
"An eye for an eye" is old testament (Exodus 21:23-27). But by my reading of it, it is more about restitution than retribution. So if you take an eye, than you much make amends with something of equal or greater value. Perhaps over time the intent has been misinterpreted and perverted.
"23 But if any harm follows, then you shall give life for life, 24 eye for eye, tooth for tooth, hand for hand, foot for foot, 25 burn for burn, wound for wound, stripe for stripe.
26 “If a man strikes the eye of his male or female servant, and destroys it, he shall let him go free for the sake of his eye. 27 And if he knocks out the tooth of his male or female servant, he shall let him go free for the sake of his tooth."
Could #5 be something like expressing remorse, asking forgiveness, and making restitution?
Would this be the "Christian" way?