> American police forces are already stretched to the limit and can be easily tied upWhich is why state police and then the National Guard and then other branches of the military become involved in any serious unrest. E.g. Ferguson for an extremely recent example.
> say 10% of the population
Overwhlemingly dispersed throughout suburban and rural populations that are far more easily controlled than a large urban uprising. And also, it would take extraordinary circumstances to find 10% of the population willing to commit to an armed revolution. If you have that many people that angry, odds are that the democratic process would work far better anyways. That's the rub with this fantasy and why it hasn't happened in recent memory -- once that many people are that angry, they probably have a sympathetic majority anyways.
Keep in mind that the United States has 2mil+ prisoners and has absolutely no problem keeping the police. If we assume only a small fraction of people who could land in prison actually do, then it's entirely possible that 10% of the population is or was at one point at danger of being locked up and still would never commit to an armed insurrection.
Also, only ~60% of the US even votes. So 10% is a truly huge number.
Actually, the most ironic thing about this part of the gun debate is that the people who are least persecuted by actual systemic violence against subpopulations of the United States both 1) insist that this violence doesn't exist or is justified; and 2) worry about their own non-existent completely hypothetical persecution at some vague distant point in the future.
All the while, people who are in actually persecuted groups (poor, racial minorities who have double digit odds at incarceration) don't get involved in the gun debate because they know the "standing up to the man" fantasy is dangerous bullshit.