It's totally sane when looked at through one lens, and asinine when viewed through the other.
From a societal point of view, banning these products makes sense. They don't add value to the world, but they cause a lot of damage. The people who feel they are flipping the bill for the damaged caused don't see a reason that they have to pay it. The costs can be abstract, like increased medical costs, but they can also be direct, say, your child gets hooked on one of these and suffers some sort of medical complication.
From an individual perspective, then banning these products seems ridiculous. It's pretty common for people to believe that they aren't impacting others with their choices (which is wrong), or they acknowledge the negative impacts, but they just don't care.
Generally speaking, if you want to maintain a freedom, it is advisable to not bother other people with your activity.