Almost all of these are facades with no access, no floor built inside them, fake windows, etc. They would take considerable reworking to make into actual guard towers, wherein it would be easier, more expedient and cheaper to actually build new towers.
One must therefore explore the why's, not the how's. My vote: psychological warfare through architecture. Much like brutalist architecture is designed to be subtle oppressive, this is proto-police state architecture. Designed to make you feel always watched by someone on high. Because you are.
Or that meme is simply leaking into the subconscious of the architects, and it comes through in their designs.