Why do elevator buttons only turn on?

I accidentally pushed the wrong floor and started wondering why they don’t make elevator floor buttons on and off. I guess the manufacturers feel that you must stick with your decision after you make it…but I resent that attitude. Well, unless of course it’s a friggin emergency. Yeah, “if you are gonna bother the building people with the emergency button, we’ll give you the option of turning it off!” Doesn’t that seem backwards? Seems that you’d be more likely to press the wrong floor than push the emergency button. So why then would they only let you undo the emergency button and not a floor button?

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