Wow...Just wow...
Umm...as others have said, the single guiding principle to ANY conflict, is the willingness and determination to win, irregardless of if you're just buying a new/used car, or fighting for your or your loved one's life.
That said, his scenario would work if it was uneducated armed mob vs uneducated armed mob, where both mobs by some freak accident exchanged their clubs and crow bars for fire-arms that they scarcely have any idea how to use, oh and both crowds are deaf to boot. Then his scenario would work perfectly. Heck, forget even about artillery or air-support, since chances are armed mob A will not know how to use any to attack armed mob B. At that point, just grab a BRDM, Stryker, or any vehicle armored against gun-fire and run all of them over.