...and then deletes the file.

-> or just get angry when they reboot and cant get back in without unplugging it from whatever remote location it was plugged into and taking it home to plug into a keyboard mouse and monitor.

great for the effort. i did baulk when i first started a pi to find the defaults were so insecure. But I'm not sure the solutions are that helpful. cant we just set a root password on first boot like every other nix distro.