Again, instead of parroting anti-rights talking points, maybe actually check how "longstanding" those prohibitions actually are, particularly at the Federal level. Prohibition on possession by and sale to all felons, the adjudicated mentally ill, and drug abusers, narrowly defined individuals, not comparable to the general public, only dates to the 1968 GCA. The prohibition on carry on school grounds (and then only without a state permit) to 1990's GFSZA (which revision remains untested as to Constitutionality). Government buildings are a similar case. I was born in 1971, 1968 is barely more than my lifetime, so by that wording I am "longstanding."

Prior to that, most such possession and purchase restrictions (such as may-issue carry laws) in the US were explicitly designed, and in many cases openly stated, to be applied only to racial minorities or members of out of favor political groups (NYC's Sullivan Act was designed to disarm Tammany Hall's opponents while leaving theirs armed).