Yeh, the philosophy goes something like this: "We own the gold, we own the guns, now do what we say(while we do what we want)".
I'm sure they think they are. That's part of the problem, the other part of the problem is that they don't know thats none of their business. A well meaning tyrant is still a tyrant.
I can come up with a whole laundry list of things that "would be best" for other people, and if they were made law, people might be a whole lot better off in some ways, such as wealth, efficiency of time, finances, life span, etc..., but they would be a lot worse off in terms of freedom.
It is not the proper role of government in a free society for government to play mommy and engage in social engineering, and the fed violates its constitutional charter by blackmailing states to enforce its drinking age.