Unfortunately (or maybe fortunately?) we seem to normalize violating the rights of minors.
Secondly, restricting minors from certain acts is very common in most countries because they aren’t old enough to know better.
It is very common in western countries to forbid stores to sell alcohol and tobacco to minors. Would you argue that the store owner’s rights were violated?
Selling alcohol and tobacco aren’t expression, authoring and publishing creative works is. Please do not conflate the two.