Interesting thought but should we pay someone to dismember a vivasectionist? Maybe pay a professonal rapist to hone out an offender? It's an odd juxtaposition. Both the offender and executor of the punishment should be done away with, otherwise we end up with the stigma of the religious cleansings of the dark ages. Not good.
I do think that the family of those offended should have the choice. JMO.
