I do not view someone being transported by a competent adult and an incompetent child to be functionally the same.
But that's only because you assume the adult is competent and the child is not. There are plenty of incompetent licensed adults and children who would be competent enough to be licensed if given the chance. In other words, your personal bias clouds your view.
You argue that the mandate is proper because paying a tax and having insurance purchased for me is functionally the same as being forced to purchase insurance through an intermediary at threat of penalty. However, if someone views the government, the intermediary, or some other party as incompetent then they are not functionally the same by your logic. And the issue of competence is one of opinion, not fact, so the argument is not valid.
The McCarran-Ferguson arguments have gone nowhere, and they won't go anywhere. Congress explicitly expressed its will to regulate insurance in this way in this statute. An act of Congress can't be illegal due to another act of Congress. In areas of conflict the courts would have to decide which law applies, and it's unlikely that they would decide that a recently passed explicit regulation by Congress would be superceded by another federal statute passed a long time before.
So actually I think the legal argument really is that clear. 1.) interstate commerce found. 2.) universal participation found 3.) regulation enacted to govern such participation in commerce.
Errors:
1) Under existing law health insurance is not interstate commerce.
2) Universal participation in health care is true, universal participation in health insurance is not. Again, health insurance != health care. That is a fallacy that continues to be made.
3) The regulation enacted does not govern participation in commerce, it seeks to create commerce where none existed for the sole purpose of regulating it under threat of penalty.
If Congress wanted to regulate the interactions between a patient and provider that would be ok under existing law. If Congress wanted to regulate interactions between an insured and insurer that would not be ok under existing law.
The mandate itself doesn't do any of the first and only does some of the second but the big problem with the mandate is it seeks to force private citizens to engage in a private economic transaction for the sole purpose of then regulating that transaction.
If Congress had wanted to regulate
health care properly they should have regulated
health care and not
health insurance.