You are correct, Rutley.....these "hooks" are not being installed to the inside of public lav doors....and some older places are now removing them. Here's why:
The number of purse-snatchings under these circumstances, has risen to an astounding level....everywhere, most especially in big cities.
While a woman is seated, a hand can easily reach in and grab your purse so quickly, you don't know what hit you....BOOM! Your purse is GONE.....Then, you get the picture...the woman, screams, (maybe finishes what she was doing, wipes and pulls the old pants up)......fumbles with the lock and the door, because she's is in total panic mode....and OH yes, by then......a quick-footed little weasel is so long gone.....it's not funny!!!
My question would be.....fine....then why not put the hook up on the wall behind the commode, right??? Seems simple enough to me!