Why do some people just "have" to have the lights on?

I realize at night, you need lights to see.
But what about in the daytime?
99% of offices and homes in America are still lit enough to see in during the day, even when no lights are on at all. There’s enough ambient light splintering through the blinds, and coming from computer monitors.
It’s 100 degrees in many parts of America right now.
LED and Fluorescent lights not only take energy away from the A/C in communities that cycle their electricity during peaks… but LED’s and Fluorescent bulbs add about 5 degrees of heat to a room, if they’re all on, and left on.
So…. on hot 100 degree summer days, why do so many office workers and others “just have” to have the lights on?
(I realize there’s some exceptions… cooks… and drafters…. for instance… need bright light. I’m not talking about them, where the light is integral to the job).
But why does an office worker need overhead lights in the summer? Why add that 5 degrees of heat?
It’s so easy to work with the lights off. But a lot of people get scared or something. Why?