The second and third examples are safety lockouts [0] working as intended: Some system is locked in the off state to ensure safe access for technicians.

Especially the padlock lockout is simple and effective: As long as you have the key in your pocket, you can be sure than no one is going to turn on the meat grinder you are cleaning.

[0]: https://en.wikipedia.org/wiki/Lockout%E2%80%93tagout

Creators of some keyboards placing a sleep button right above arrow keys didn't bother doing this.

[1] https://www.youtube.com/watch?v=se0F1bLfFKY

[2] https://cpc.farnell.com/rjs-electronics/rjs-k16-391-ge-65j/i...

For the power button is located next to two USB ports I use and, for whatever reason and although it's a very good PC tower, the button is ultra sensitive.

So I created a "not-molly guard" that "plugs" into the two audio jacks (which I never use and which are, also, next to the power button) and that only leaves a narrow hole and a guardrail of a few millimeters.

Printing it in black, matching the tower's lip where the power button is, and life is good. Already hit that Molly guard several times by mistake so I figured out I already saved more time than it took to design it.

As it's a small piece, it printed in a few minutes on the 3D printer.

P.S: AFAICT there's no software setting (?) to prevent the power button from doing what it does!? But who cares, I've got the Molly guard now.