“The right to keep and bear arms shall not be infringed is pretty easy. The prefatory clause that Leftists hang their hats on is totally superfluous.”
The big problem is not the prefatory clause. The big problem is that “The right to keep and Bear arms” is not defined. Without an agreed to definition the other side can say that whatever they propose to limit is not an infringement because what they propose to limit is not included in the “right to keep and bear arms”.
For instance, they might say the “right to keep and bear arms” does not cover a five-year old walking around with a 1911 Colt pattern pistol in his hand with a round in the chamber, cocked with the safety off.
Minor children do not accrue full rights. They can’t vote, for instance. That’s the whole point of attaining your majority.
Your argument fails.