BPSCG said:[...]
Here's my enlightened, merciful solution that gets back to my "rupturing the social contract" argument earlier. You take the vicious killers and exile them (there's gotta be a few islands somewhere...). You tell them that we (society) wash our hands of them - they are on their own, whether they live or die is of no concern to us, because they have irredeemably ruptured the social contract. We will neither help them survive nor attempt any harm to them, since we have no further obligation to them. As long as they don't come back. If they come back, they're executed. Not for revenge, but just because we have the right to protect ourselves.
There are no such islands on the planet. The place would be accessible to any outsider capable of financing an expedition there -- for example someone intending to profit from springing the convicts. US authorities would have to guard the island against intruders 24 hours a day. And in order for that to be legal, I assume the island would need to be US soil, which would mean you had certain obligations to your citizens there -- such as providing health care and law enforcement. Effectively you would end up with just another prison.
If you don't care whether they escape from the island, this wouldn't be a problem, of course. Just drop them off. But I don't see how you could prevent them from coming back. Wouldn't you need to re-write quite a bit of international and domestic law in order to execute a US citizen for entering the US?