Even if the standing armies, under a tyranny, surely could win out over even an armed populace, that is no reason to allow disarming OF the populace under the notion of, "Well, what's the point nowadays?"
I don’t disagree, but if one of the central arguments underlying the right to bear arms is to “repel invasions” before an army can be organized, then we’ve already long since ceded that argument by allowing the federal government to maintain standing armies in times of peace.