Right, but choosing the lesser of two evils is simple enough. That's not the kind of dilemma I'm talking about. I'm asking whether or not there are wholly undecidable moral problems. Choosing between one evil and a lesser evil is no more difficult than choosing between an evil and a good.
But if you're saying that in any hypothetical choice, we could always find something significant and decisive, then this is good evidence for the impossibility of moral dilemmas.
It's hard to say, really.
Suppose we define a "moral dilemma for system X" as a situation in which, under system X, all possible actions are forbidden.
Consider the systems that say "Actions that maximize this (unbounded) utility function are permissible, all others are forbidden." Then the situation "Name a positive integer, and you get that much utility" is a moral dilemma for those systems; there is no utility maximizing action, so all actions are forbidden and the system cracks. It doesn't help much if we require the utility...
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