3 gunman, 100 people...rushing them would work, if most worked on rushing them
The problem that MOST people have - is that they do not have the capability of staring somebody in the eyes while they strangle the life out of them or drive a knife into their heart until you see their eyes go dead.
Without being able to do that - when you're stuck in a situation like this you're sort of screwed whether or not you have a gun.