You tell them it's against the law to drink, and they'll point out that it's restrictive and controlling. You tell them it's against the law to commit tax fraud, and they'll have no objection.

Why? I think, at least with the people that I know, it's related to what they want to be able to do. They want to be able to drink alcohol, so it feels controlling to tell them they can't. They aren't interested in committing tax fraud, so they're not bothered by that being restricted.