This is more or less a large scale version of the trolley problem.
I have no point to make other than to observe that the trolley problem is specifically designed to expose how "conventional ethics", as measured by people's intuition, is neither consistent nor utilitarian-optimal.
I think the trolley problem makes it clear that there is a price to be paid for moral decisions. It is not that conventional ethics are wrong, it is that it informs us that we can make the future either way, but not both ways.
The trolley problem pushes us deeper into our ethical selves, it does not prove that all ethics or decisions are wrong.
I have no point to make other than to observe that the trolley problem is specifically designed to expose how "conventional ethics", as measured by people's intuition, is neither consistent nor utilitarian-optimal.