Telling these people about threat modeling completely destroys their arguments. The arguments are lazy, a thin veneer for corporate profiteering, rent seeking, and restrictive behavior.

Youre right - granny isn't installing unsigned binaries and anyone proclaiming otherwise is just bullshitting you.

The reality is that there is no security here. We have massive, glaring holes in the systems we use. Adding a door lock when there's a giant hole in the wall next to it does nothing.

Granny is being scammed via phone, but nobody wants to fix that. I wonder why? Hm, maybe money has something to do with it.