Minnesota’s ban on 18- to 20-year-olds obtaining a permit to publicly carry a handgun violates the US Constitution, a federal appeals court ruled Tuesday.
I think you’re reading a bit too much into that amendment. It doesn’t say anything about individual rights, or the government infringing on them. It simply repeals the 18th and all related laws.
Funnily enough, we do have an amendment allowing it, though it does not prohibit state governments from regulating it. All it would take is a simple bill of congress to end the requirement that states set a 21+ law. https://en.wikipedia.org/wiki/Twenty-first_Amendment_to_the_United_States_Constitution
Edit: oops this was meant to be a reply to the other comment
I think you’re reading a bit too much into that amendment. It doesn’t say anything about individual rights, or the government infringing on them. It simply repeals the 18th and all related laws.