

You have to understand that the average American functions off of lizard brain impulses. It would be probably go like this:
Acknowledging age concerns of the electorate = show of weakness.
Running someone fresh that appeals to this American Idol-esque popularity contest = show of weakness.
Running someone Republicans don’t have their talking-points fleshed out on = show of weakness.
America operates on principles of running someone strong who says they will always be strong and that if they ever become weak while in office and they acknowledge this to be replaced, the entire party goes with them like a tug boat latched to a sinking oil tanker. Trump didn’t win because he’s smart or a decent human being. He won because he exudes baseless confidence like a broken nuclear reactor exudes gamma radiation.
I really disagree. The aliens being insects is perfect because it provides a justaposition with the human characters. The idea is that the insects are a swarm of mindless drones. Meanwhile, the humans are…well, also a swarm of mindless drones. Which is sort of the point of the movie. The fascist society they inhabit actively dehumanizes them and robs them of their ability to think for themselves. The visuals of the film reinforce this in the larger fight scenes: the mass of gray bodies that constitute the human forces all blend together into a single swarm, much like that of the insects. And by the end of the movie Rico is completely hollowed out as a character: literally just inhabiting the same role as Rasczak, and even parroting all of his phrases from earlier in the film.