When you say "denying them access to the worst sorts of weapons", are you proposing that certain group can keep their rights of access while others cannot? How can you really apply that in an objective manner?

Or perhaps you mean in a broader sense remove them access to all kind of platforms to not spread hateful messages?

Those are dangerous discriminatory power to give, as today it might target your opponents and tomorrow yourself.

The reason I bring this up is not because I care about white supremacists per se, but because it's a tool to start applying "hate speaches" politics, where hate is itself very subjective and too often interpreted as "things I don't like to hear".