The why oh whys

I don't understand why some functions exist in machines and gadgets. Why is there the capacity to flip your screen upside-down when the cat stands on the keyboard?  I mean,  who actually needs that?

Also, in the car, why accidental knock of button = internal lights stay on (again). A button that really has no business being connected to those lights. Surely buttons relevant to those lights should be the ones visibly attached to them?