1. I will always be skeptical of the whole "I'm a parent and (...)" -- I guess because my own parents were keen on letting me fuck around and find out when I was a kid? After two ice cream binges end on being horribly sick, even a kid can go "... Yeah I'd better not". I should know because a similar scenario happened to me. I feel like trying to use -authoritative control- to keep people safe will just make them desire the thing they are being kept from even harder, and this is universal for children, teens, and adults alike.
2. Fair enough
3. Yes unless the person becomes a danger to other persons. The idea of a body being sovereign also applies the idea behind sovereignty of nations, I.E.: Once a nation starts fucking around starting wars, suddenly infringing on their sovereignty to put a stop to it is a good thing.
4. This is a bit of a thing so I'mma break out of the list format so I can use more than one paragraph lmao:

In general my argument is that copyrights as they exist right now are a stifling force that mostly protects corporations while punishing both small creators and just... Regular individuals. For engaging in like. Human culture. Since I was suggesting lines for a constitution and a constitution is generally meant to be a sort of meta-law, like 'these are the intents of this state that we are forming, so the actual laws will reason on the practical application of it based on the intents', I didn't speak as to how this might be in practice. But to actually get into it --

I recently read the works of Lawrence Lessig, who is a bit of a stick in the mud and too much on the side of corporations for my liking, but when talking copyright the point he makes, which is a good point, is that at their root, copyright laws seek to regulate creativity as a commercial activity, I.e.: So you can't deprive creators of the money they might make from making stuff to sell by just waiting for them to make it and then reselling it. And that in the age of the internet where the line between "commercial creativity" and "just human culture being human culture" has become hopelessly blurred -- And that bad actors seek to keep that line blurry because it invests them with power. Power to use invasive DRM schemes. Power to charge for repeated viewings of something already purchased. Power to control what is even said about their product.

So if I were to make this into actual law, I'd make it so that every creative product would necessarily be copyrighted to a person or persons rather than a company. Because even bigass team projects are not made by a studio, but by the people that made them. Disney didn't make Aladdin 1991 -- It was written by Ron Clements, John Musker and Ted Elliot. So the story should belong to them. The amazing music was written by Tim Rice and Alan Menken, so it should be theirs, while the performances of said music in the movie should belong to the performers, the animation? It'd collectively belong to the people that made the drawings.

It's more overhead than saying "THIS CORPO OWNS IT ALL BECAUSE THEY WERE WORKING WITH THIS CORPO" but it is ultimately needed, because this in itself would already do a lot to cull what, to me, is the biggest abuse within the copyright system. If something belongs to a person, that person will eventually die, and at that point the whole "you are denying this person the fruit of their own creation" argument dies with them. A corporation is an immortal abstract entity and should never be allowed to own -- Anything really.

I would also ensure the text of the law specifically protects creators against people profiteering off their creation without them being duly compensated -- So like, selling copies of someone else's art? Crime. Showing other people the art with no commercial intent? Not a crime, can never be one.