There have been many fads in the world of gaming, certain tropes and choices that developers have relied on to move cartridges and discs. One of the easiest ones to look at is common enemy types. In the early days of gaming we had things like Galaga and Space Invaders. Games that encouraged us to look to the skies for a new species and then blow said species seven ways from Saturn.
After aliens we went through Robots into Soldiers and then two enemies kept rearing their heads like a Whack-a-mole game on overdrive; I speak of course about Zombies and Nazi’s. The push for Nazi’s saw them appearing in a hundred different RTS’s and FPS’s on every console and home computer going. The simple truth is that there are a very few people in the world that would feel bad for attacking them, virtually or in reality they have been, rightly so, painted with the brush that makes them almost universally hated.