The trouble with all of these questions is simply that they are designed to force a big contradiction - and whatever answer you give the questioner usually has

The trouble with all of these questions is simply that they are designed to force a big contradiction - and whatever answer you give the questioner usually has an "aha but....." ready for you. The issue is that these problems are never "real world" and so are irrelevant to any actual discussion. Contradictions are, clearly, problematic - but only if we are going to face them. Until then they are just interesting diversions (pretty much like all of capital-E Ethics) I'm not sure there is a real world problem that is completely morally insoluble.