Maybe. Mixing legality and morality is popular enough though. In other words: "the drinking age should be 18, but it isn't, and you should respect the law".

I suspect many would also oppose dropping the legal age for MADD inspired reasons (god I hate that organization.... bunch of neo-prohibitionists...) even though they think their kid is responsible enough.

I do agree though, most probably do think that the age could be lower.