@littlepaddypaws
As it happens, I don't live on Mumsnet waiting to answer your questions & haven't had a notification that there were replies on this thread.
I know preppers from all over the world, quite a few have weapons all of which are legal in their country of residence so it would be different depending on where they live.
A lot of them learn to make things as they get more into prepping & generally at some stage will learn to work with metal so they will learn to make knives because they are relatively simple.
Country dependant they may also learn to cast bullets etc..
Their wives (the ones I know) are either just as into prepping as they are or they roll their eyes because their husband is in his workshop fiddling away with his latest attempt at a faraday cage or whatever, but as their husbands are sane they view it the way other women view their husbands incomprehensible hobbies.
Most of them are never anywhere near as extreme as those guys on the American tv shows.
I know a (non prepper) wife of a man into historical re-enactments who has to put up with her husband sitting there night after night making links for his chainmail coat.
People do strange things.
I personally think painting yourself in an untested mixture of chemicals is strange, yet most women do it everyday.
We live in a world full of weapons.
I grew up in a house in this country with guns, axes, knives, foils & bows that all got used pretty much every week.
All the neighbours had guns.
Sounds all very melodramatic, but actually my father went clay pigeon shooting every weekend (yes, they were locked in a gun cabinet when he wasn't out with them) & took my brother with him, we all chopped wood to put in the fire places so we had axes around, my brother fenced (still keeps it up to this day) then went through a phase of collecting other sword type things. Now that I think about it he also went through a phase of collecting nun chucks etc... whilst doing martial arts so they are probably still around in one of the attics.
At my boarding school we did archery so I had bows.
There was also the fishing with it's attendant gutting knives etc... & my father grew up hunting (for food not sport) so had a complete set of butchery tools.
He could start with a pig (purchased from the farm down the hill) & end up with a cured ham.
Perfectly normal & innocent reasons for a house full of weapons.
Every farmer in the area (aka all our neighbours) had shotguns & they weren't preppers (neither were my family)
It's not uncommon.
Personally I'm now old, I'm also short, female & going blind.
The place I live nowadays is nowhere near as isolated as my childhood home.
I don't bother keeping weapons because unless I've got a tank & someone to point me in the right direction I'm going to lose any physical confrontation.
All the guy next door has to do to beat me is grab a spoon from the kitchen & I'm outmatched.
I wouldn't even be able to see it until he got within arms reach.
First however, he would have to have a reason to come looking & I don't give people a reason.
As for the OP, there is a very common prepper saying I've even seen quoted on here before & Mumsnet is prepper lite.
Two is one, one is none.
Preppers like to have (multiple) back ups, especially the Doomsday guys.
You probably don't know about half of the things he has stashed.