New York City's placebo buttons and "The Post Hoc Fallacy"

Spot on. Not every place on earth is just like NYC, which in my opinion is a win-win-situation.

BTW, where I live we don’t have ‘close door’ buttons in elevators, just ‘open door’ buttons.

That being said, placebo buttons do occur from time to time. 15 years or so ago I was part of a project to build a block of some 300 offices. Every office had a little plastic box on the wall with a dial on it “to control the ventilation system”. There was even a neat cable running from the box to the tiled ceiling. While the ventilation system was controlled centrally, but every office inmate (it was that sort of company) hat a little knob to play with. Never had any complaints about the ventilation.