I think you just don't get it.
Individualism doesn't require a society free from rules, with every person allowed to do whatever they want.
The Protestant and Calvinist roots of American culture emphasize individual moral agency and personal accountability. This makes it easy to view things like addiction as a personal moral failure or lack of discipline rather than a systemic or biological illness.
At the same time, these same Protestant and Calvinist roots supported a level of paternalism in the form of blue laws, temperance movements, vice squads, etc.
You are arguing that laws regulating "sin", which are intended to promote public virtue, are evidence that the US really isn't individualistic because they're (in principle) taking away your ability to do whatever you want, but what you're missing is that criminalization contributes to the widely-held belief among Americans that people who break those laws are weak, undisciplined people making bad choices.
Most Americans don't view "sin" laws as social welfare. They view them as moral boundaries, and when someone crosses them (say, into addiction), the default is to place the blame on the individual's own willpower. You chose to do drugs. You got addicted because you couldn't control yourself. You failed at recovery because you're undisciplined.
This is pervasive in the US and it even extends to issues like poverty. Three-quarters of Republicans and over half of independents believe that personal choices are a major reason people are poor.
https://thehill.com/business/economy/5495065-americans-perso...
Which reminds me of one of Kurt Vonnegut's most insightful observations about American culture:
> America is the wealthiest nation on Earth, but its people are mainly poor, and poor Americans are urged to hate themselves. To quote the American humorist Kin Hubbard, 'It ain’t no disgrace to be poor, but it might as well be.' It is in fact a crime for an American to be poor, even though America is a nation of poor. Every other nation has folk traditions of men who were poor but extremely wise and virtuous, and therefore more estimable than anyone with power and gold. No such tales are told by the American poor. They mock themselves and glorify their betters. The meanest eating or drinking establishment, owned by a man who is himself poor, is very likely to have a sign on its wall asking this cruel question: 'if you’re so smart, why ain’t you rich?' There will also be an American flag no larger than a child’s hand – glued to a lollipop stick and flying from the cash register.
> Americans, like human beings everywhere, believe many things that are obviously untrue. Their most destructive untruth is that it is very easy for any American to make money. They will not acknowledge how in fact hard money is to come by, and, therefore, those who have no money blame and blame and blame themselves. This inward blame has been a treasure for the rich and powerful, who have had to do less for their poor, publicly and privately, than any other ruling class since, say Napoleonic times. Many novelties have come from America. The most startling of these, a thing without precedent, is a mass of undignified poor. They do not love one another because they do not love themselves.