Like I said: Even an organized and well trained militia are pretty much useless against a modern military. Police departments around the country have armored vehicles for these situations and any militia that gets too "uppity" is begging for a drone strike... or even just a mortar.
But yes. Individuals can't do anything. We only have strength when we work together and look out for each other. An individual buying a gun to "protect themselves" isn't gonna do shit and is mostly just going to escalate things rapidly. Whereas a community protecting themselves, with firearms or otherwise, can at least buy time.
But that requires coordination and a LOT of focus on "optics". Again, The Black Panthers are historically one of the best examples of this. Yes, they have guns and do armed patrols. But mostly it is about community service and outreach so that killing one Black Panther means you are accepting the murder of that entire community. That isn't going to stop things once things accelerate to a full blown civil war (just look at Vietnam, Iraq, and Afghanistan for what the US military will gladly do to a village...) but it DOES buy time.
But Americans have this mindset that just buying a gun turns you into John McClane and you are going to single handedly solve all the worlds problems in three respawns or less.