Those panic buttons in the high school cafeteria still beg the question: who thought panic buttons would be a Good Idea? I recently served as a judge for the Science Fair qualification show and found some variations on the theme.
One seems in good shape, although I don’t know if it’s been repaired:

Several have missing buttons, but the innards seem intact:

In the event of an actual panic, I suppose you simply yank the cage off the wall:

I cannot imagine what logic justified protecting one button and leaving the others to the tender mercies of the student population.
Our tax dollars at work, for sure…