... the first thing they do when they get it into their hands is wind on the shutter, or try to open the back. ...
You just handed a gadget to gadget-intensive people. What do you do with a gadget? Fiddle with it! Put something into someone's hands and of course they will start messing with it. I don't mind with my view camera, because the film is in the holders.
when i go to a photo store that has film and paper, i always open the boxes and sleeves of paper
boxes of film ( and those annoying foil packets ) and sometimes pull some of the 35mm out of the cartridge.
to make sure the film and paper are in there, before i buy it, i don't want to get ripped off.
I try out every match in a box in the shop before I buy them!
I noticed the same with one person, but i pronounced a loud "hey" and quickly and efficiently woke that person up from their object fondling trance state reminiscent of the infant years, with the mouth open and big wide eyes and stuff...
Nobody ever handed me a film camera before though...maybe back in 2000 but i dont remember.