Better to have it and not need it then need it and not have it.Seems like your being a bit irrational, "armed posse".
Have you ever seen a fire fight? I have. I've also seen where your ability to shoot accurately under pressure degrades as the stress ramps up. How many times have you seen police get into a fire fight? I've seen lots and one thing I've noticed is that one mag is never enough when your under stress. Try hitting a moving target with one shot. Not likely to happen.
I have noted that in many forums of off-roaders carrying weapons into the back country. So does that mean off-roaders are paranoid? There are a lot of illegal drug sites in the California mountains run by well known Mexican gangs. However, I'm not talking about the two-legged animals, more like the four legged type. Mountain lions, bears, etc. You never know what is out there that would make a meal out of you. Not paranoid, just prepared.