Regarding your second point, I would strongly caution against considering even the most egrigious offenders for forced organ harvesting. There are currently serious allegations regarding China's black market organ trade (briefly, that political prisoners, dissidents, and minority populations are quietly executed and harvested to supply China's thriving organ market). As medical advances in transplanting improve and expand the ways we can repair the human body, this will only become more of a problem in the parts of the world where government designated "undesirables" can be quietly disappeared.

It is simpler, cleaner, and less prone to malfeasance and corruption to limit organ harvesting to registered consenting individuals and lab grown tissue, where a chain of custody for the tissue can be established.