army1987 comments on Rationality Quotes September 2012 - Less Wrong
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Depends on what you mean by “undecidable”. There may be situations in which it's hard in practice to decide whether it's better to do A or to do B, sure, but in principle either A is better, B is better, or the choice doesn't matter.
So, for example, suppose a situation where a (true) moral system demands both A and B, yet in this situation A and B are incomposssible. Or it forbids both A and B, yet in this situation doing neither is impossible. Those examples have a pretty deontological air to them...could we come up with examples of such dilemmas within consequentialism?
Well, the consequentialist version of a situation that demands A and B is one in which A and B provide equally positive expected consequences and no other option provides consequences that are as good. If A and B are incompossible, I suppose we can call this a moral dilemma if we like.
And, sure, consequentialism provides no tools for choosing between A and B, it merely endorses (A OR B). Which makes it undecidable using just consequentialism.
There are a number of mechanisms for resolving the dilemma that are compatible with a consequentialist perspective, though (e.g., picking one at random).
Thanks, that was helpful. I'd been having a hard time coming up with a consequentialist example.
Then, either the demand/forbiddance is not absolute or the moral system is broken.