OK steelmanning you, certainly a lot of them are way more interested in gun collecting and making beef jerky than other aspects.
Both of which are available at Wal-Mart.
I always knew about the guns, but only recently discovered that Wal-Mart stores (at least in Louisiana) carry huge buckets with weeks worth of dehydrated survival food.
I'm sure it's for hurricanes. Yeah, that's it.
But the western Roman empire fell and cities depopulated and folks switched back to subsistence farming for hundreds of years.
And plenty of places have been at war and had much of civilization's usefulness diminished from days to decades. Not to mention straightforward natural disasters.
My prepping is limited to buying toilet paper at costco and having bags of beans and rice and such in my pantry and just... knowing how to do things in general.
That doesn't mean anybody who does a lot of research online or buys a lot of things is a obsessive hobbyist of course. The difference can at times be hard to tell from the outside, but someone whose first thought when an apocalypse brews on the horizon is to get weapons and turn their home into a bunker, instead of e.g. relying on a strong neighbourhood network and helping others is certainly a specific type of person. The problems that will arise are of the type that will be hard to solve alone. E.g. prep all you can, but what if your family member needs a doctor? Or something is fucked with your electrical system and you need someone.
This is why people make fun of preppers. Not because being prepared is a bad thing (it is not!), but because you get the feeling some of them can hardly wait for the end times to come around so they can test drive their gear.