My mother (80+) runs Fedora, and I believe she is incapable of messing it up, even if she did have the root password. Doubleclicking random exe files off the internet is almost uniquely a Windows problem. I dunno about Macs - its users are usually technically illiterate, but Apple has done a pretty good job of locking users out of their own machines.

> Doubleclicking random exe files off the internet is almost uniquely a Windows problem.

Tell that to my partner's grandfather, who managed to find and install malware chrome extensions on his chromebox.