You are right, but that's not really an apocalypse but a localised civil war. Admittedly, it would be good to be prepared for that, but I think leaving the area altogether would be a more optimal solution than grabbing weapons.
I'll grant you that the media representations are bad. I've never met a real live prepper, only ever seen them on TV, and I guess the ones they interview on TV are the ones who make the best TV.
You're right the basics are boring, but it's the basics you'll spend 24/7 trying to obtain long after your weapons and ammo have gone rusty. And if you think you'll be making your own ammo, I'd say no-one at all will have the luxury of that kind of engineering time when they're trying to get the ground to grow enough food to eat.
What's more, how are they going to make it out of the city on clogged highways? Especially when the ICBMs are already airborne?
I live in the country already. We have chickens, and a well. We won't get murdered in the urban panic. We will probably last a few months... and then die of disease or starvation like the rest.
And this is the problem with preppers in general. I don't know if it's too much Walking Dead or just a mindset they have to start with, but as someone else pointed out they seem to be far more obsessed with guns than with clean water, sanitation and heating.
Guns aren't very common in my country so I'm not worried about gun-toting locals rampaging around. Sure, a few might raid a military base or a farmer's shotgun cabinet, but statistically I think my family would be under far more threat from hypothermia, cholera or an infected scratch.