But that’s not how militias were organized. Having militia men bring their personal firearms is a practice that long predates the US.

I am of the view, though, that the right to bear arms, while personal, is still connected to potential militia service. I don’t think it follows from the second amendment that you can carry your guns around in public, etc. The second amendment is both broader and narrower than the Heller interpretation.

My reading is that the intention was for the states to have right to keep Swiss style volunteer armies, but what was dangerous was the "well organized militia" bit so it's not implemented. Instead guns and ammunition are allowed to be freely distributed to prevent the organization and exacerbate chaos between the people in the event of uprising against the government. If the anarchy comes, because of the prevalence of guns and lack of organization local warlords will quickly arise and mostly kill each other in struggle for power. Then the oppressive government comes in and just sweeps the thinned herd.