There is no rational reason to keep them alive at such a sacrifice, or any sacrifice, for that matter. Unfortunately, they will not be done away with by our present administration. The collapse will come and most of them will perish in the resulting chaos, along with most of those presently in power. But when the worst has passed and normal humans take over, such vermin will be destroyed as a matter of course. When ridding society of their kind becomes policy we'll need few police.