>how many people will assert there must be something bad

Some of my friends seem to be convinced that Pigouvian taxes don't work, that hoi polloi just suck up the extra cost and complain more. Also they'll say that it's regressive (i.e. the thing being taxed already represented a higher proportion of income for the lower classes).

What I'm getting at is, I agree with you, but I don't think the objections are all that nebulous, nor based in "too good to be true" intuition.