But we don't; occasionally action is urgent and a lie is the only thing that can induce an urgent action in a small number of syllables.

The ends justify the means--how delightfully consequentialist!

Further, of course, sometimes, the situation is severe enough that the business end of a weapon is the only thing that can effectively induce action. The heart of the question is how to choose the least bad approach that is sufficient to attain the necessary results when you may not even have enough time to follow Yudkowsky's exhortation to "shut up and multiply".

Ethics is difficult.