Why operate the tower at all during low-traffic hours?
Agreed. See sentence two of my post for why the assumption was that the tower would have to remain open even without enough traffic to warrant it. (Union.)
Add in that the general public believes that aircraft only land when the magical tower words, "Cleared to land" are invoked by the Wizards of the Tower, which has already been covered adequately here... Er, beaten to death... and those mouth-breathers represent the majority of the votes a politician needs to remain in their cushy job that strokes their ego.
Okay, all caught up now. Thought all of that was pretty obvious. Guess not.
Can you explain the similarity between UAVs and control towers?
Both can easily be operated remotely (in low traffic density environments). Was the sentence that difficult to parse?
If the public won't stand "unmanned" towers and also won't stand sleeping controllers, there are ways to make the public believe the tower is "manned" from afar which serves the dual-purpose of side-stepping the politics of shutting them down at night, and still keeping NATCA happy with one guy sitting at a "UAV style" control console "running" five towers.
He could probably get a good nap in while doing it, too.
Thinking outside the box, since it's required with all the strange "needs" of everyone involved.
Meanwhile no one "needs" most Towers to be manned in the middle of the night other than NATCA and politicians dealing with keeping morons happy... but those requirements will outweigh common sense for certain.
It's America. Why would we do the simple, effective thing first? (Close the towers at night.)