Without starting a whole Us v them and a whole pro/anti gun thing. This is what its like where I'm from.
In NZ, you can't 'carry' firearms on you, and they are not easy to get in the first place, handguns are only obtainable as part of a pistol club. Most farms have shotguns or rifles, I have one, for trap shooting.
There's a few hurdles to jump through to get firearms, you have to pass competency tests and prove you know how to handle, store and care for guns, as well as have a place to securely store them.
As far as carrying while riding, its well and truly illegal on someone else's land, as most rides are pre organised on one or many peoples land, and almost never public land that anyone can use at any time. The chances of coming across something you weren't supposed to, especially that the ride organisers didn't find first, are slim to none.
There'a also virtually no wildlife big enough to hurt you, maybe a wild boar, but they don't stay around loud bikes very long.
I suppose if you were riding in places that you technically shouldn't be, then the chances of bumping into someone and their 'stash' increases, but I dare say even they aren't stupid enough to build something like that right next to a track of some description.
I guess its just the whole idea of having to carry firearms for protection while riding is very foreign to me, and is just second nature to you guys. Although if I was confronted by a bear I probably would want more than a stick for protection.