PC bigots are those kind of idiots. Among other titles I held, I was a senior Windows admin over servers and desktops, directing other techs. There were a few workers who insisted on downloading crappy freeware from the net, even though it corrupted their machines. So we blocked their ability to do so. And they would work around the blocks, and re-infect their PCs, then call us for help. We were an IT shop, and these were for the most part high-up managers and supervisors who felt they were entitled to put anything on their desktop PCs. Idiots all.
The problem really is that end users have acess to an admin account, or in the case of Unix, root. This should not be allowed.
That’s why I have no sympathy for those who shell out big $$ to have their computers “cleaned” on a regular basis. Not far from me, there is a computer business with a big vinyl banner out front: $90 Virus Removal!”. A person with ANY brains at all could buy a premium anti-virus suite with a couple of years worth of updates for that kind of money (or less). Of course, buying such software, installing it, then never allowing it to update, scan your emails and web traffic, and regularly scan your PC makes it about as useful as that anti-biotic the Dr. prescribed for the person with strep throat who takes it one time and then puts it on the shelf...