The background checks would be a lot more useful if there wasn’t an easy workaround.
As for passing a sniff test, I observed this in a sporting goods store:
Guy walks in with Nazi and white supremacist tattoos all up his arms. Wants to buy a gun and a big, military-style knife. Passes his background check and they are required to sell him the gun. They refuse to sell him the knife. Too sketchy.
That’s the country we live in.