I've been thinking about this on and off for half a year or so, and I have come to the conclusion that I cannot agree with any proposed moral system that answers "torture" to dust specks and torture. If this means my morality is scope-insensitive, then so be it.

(I don't think it is; I just don't think utilitarianism with an aggregation function of summation over all individuals is correct; I think the correct aggregation function should probably be different. I am not sure what the correct aggregation function is, but maximizing the minimum individual utility is a lot closer to my intuitions than summation (where by "correct" I mean compatible with my moral intuitions). I'm planning on writing a post about this soon.)