nobodypanic wrote: carrying capacity 'trumps' it the way any hard brutal fact like, say, gravity 'trumps' ethics. however, that doesn't mean that allowing people to fall to their death is ethical. in this example i can in no way appeal to gravity as the basis of any 'good'.
We are talking about the life support that allows ethics to even exist. Comparing it to gravity is nonsense. Biological necessity has a veto over the behavior which any set of moral beliefs can allow or require.