“So what’s the problem?”
I merely pointed put the facts, and passed no judgment one way or the other. Federal law is superior to state and local law when they conflict.
I would tie that to an explicit reading of Art 1 Sec 8 for the Fed Congress's Right to enact said law in the first place. If a Federal law grants them a power not authorized by the Constitution, the States have the same rights as "We the People" to tell them to get bent.