Well, being good and for the public good are separate concepts in my mind. That aside, you never addressed the smoking, seatbelt or helmet laws with regard to adults. Permissible or not?
Seatbelt and helmet laws are a condition of using property that isn't yours (the road). Likewise for drivers licenses and minimum road hours.
A good case here is the Texas anti-sodomy law (Lawrence v Texas) that was struck down in 2006(!) after being used to go after gay men. Here Texas made claims it was acting for the public good, SC ruled the state had no presence on a private matter outside the public eye.
"Mask laws" are a condition of using property that isn't yours (the road, the town square, the park, the trail). Nobody is going to force you to wear on mask on your own property.
Now, can Wholefoods (to pick a private business) force you to wear a mask as a condition of using their store? Absolutely.
Can your friend demand you wear a mask before you hang out and use their pool? Sure.
Can the government demand you use a mask on non-government owned land? No.
Can the government demand you wear a mask before entering a courthouse? Well, that becomes a whole thing and the answer is "maybe?".
There is no "government" as an owner of anything. Anything not owned by individuals (within the USA) is owned by some sector of the public (either the entire nation, or a state, or a city etc. etc.). Governments do not own courthouses, they do not own national parks.
Governments are the structures we use to make decisions about legal, economic and social policy. They are not owners - the public is.
But I've forgotten your posting history, so I can't really tell if we're in violent agreement or if you're just flipping your terminology around.
In England, at least, the law also applies in the (somewhat unusual) circumstances that you happen to own the road.
Going meta here: There seems to be a mental condition that causes people to try to interpret everything in terms of contracts and property rights. In extreme cases it leads to phenomena like https://en.wikipedia.org/wiki/Freeman_on_the_land