It's actually hard to understand on "which" side you're on, but a charitable interpretation is that you're arguing that there are no perfect solutions, hence a simple and minimal non-invasive method will probably have the same effect as a complex and invasive method. That is, both methods will add enough friction that children who don't know what they're missing won't bother and the ones who can't do without, will choose every conceivable method to get around the restrictions.

Worrying about the latter makes no sense, because they are sort of like organized crime. People still take drugs even though they are illegal.