

recent conviction of initiating physical violence
Which is pretty easy to get if you attend protests and the government intents to effectively ban leftist activists from having legal access to guns. Wrongfully charging protesters with resisting arrest is already commonplace in many EU countries, and “the protesters started it” is standard fare when people ask why the police attacked a peaceful protest. If activists started arming themselves, they would definitely use these, especially if they took them to protests (though that would be illegal anyway in my country).
So what you’re saying is, we basically can’t have strong gun laws until our political systems are deeply changed in one way or another?

Not really. They were certainly white supremacists and hated Jews, but Christianity didn’t really play a big role in their ideology. They spent a lot more time supressing local churches than going on about how christian they are, and many of them were very interested in pagan religions.