You are confusing correlation and causation. Places with Gun Control today have higher crime rates including expectation of death by gun than those that are Gun Friendly. Look at our government statistics.

And the hierarchal structure of the US Constitution and legal system (based on Common Law rather than Civil Law).

Constitutional Amendments are far above any other federal law - for example, state laws barring free speech are struck down because the 1A is most fundamental. But regulating milk is not.

Common Law generally inverts the legislative/legal process compared to a Civic Law system. The US, all British Commonwealth Nations and US territories and commonwealths are all Common Law, and that's pretty much the only places. The rest of the world is Civil Law based on French and Roman legal traditions which operate very differently and are based on different fundamental assumptions.

It's sometimes said that in Common Law, ALL things are legal except those specifically outlined by law as forbidden, while in Civil Law, ALL things are forbidden except those specifically outlined by law as allowed. That's about how big the difference is though the impact on legislative process and judicial process are nontrivial as well.