You are aware your scenario of the police and SWAT teams sounds as just as plausible as a right-wing nut jobs wet dream?
Probably to people who do not know history… Back in the Great Depression, WW1 veterans marched to DC to ask for their bonuses early because they were starving. They came unarmed with their families. McArthur, Patton and Eisenhower led the US Army in the attack on these veterans and their families. People like you said that the military would never attack their own veterans, and they were wrong.
https://en.wikipedia.org/wiki/Bonus_Army
People without weapons do not attack, people with weapons are the ones you have to worry about. Republicans have had the executive, legislative and judicial branches of government the last 2 years, and my gun rights have not been furthered. No politician wants an armed public that can stand up to the government. So it is logical to ask, who can take away the firearms? The only people with guns the way things are going are the police, so that is where the threat is going to come from.
Like it or not.