The idea is that an anonymous armed insurgency is really hard to defeat.
The US army is very good at that. That’s the kind of conflict they’ve been fighting since Vietnam. If you think a distributed guerrilla army can stand against the US military on their own soil, you’re delusional.
I’m not talking about tanks and jets. That’s so last century. That’s not how wars are fought now. There’s just no way homegrown militias would have any hope against the US military in their midst. Ask anyone enlisted in any branch of the military. I promise they’ll tell you that’s a pipe dream.