But Mirror Georgiou isn't Pol Pot. She's Ming the Merciless (in a catsuit).We get Gregory House antic from Pol Pot and their show to be humorous distraction.
The Mirror Universe isn't used to make serious inquiries into or commentaries on evil. It's there for Star Trek writers to have fun, to cut loose. Think back to the original MU episode, "Mirror, Mirror"; MU denizens act and dress like barbarian pirates, everyone carries an "agonizer", the star map-and-laurels emblem of the Federation is replaced by a big sword through the Earth - it's a whole parallel universe of cartoon villainy. By design. This trend is continued in DS9 with things like the high-camp Intendant.
The one somewhat serious thing the conceit is used for in "Mirror, Mirror" is to characterize Mr. Spock. Turns out he's pretty much the same person in both universes. As for Georgiou, I'm fine with her being funny, in the same way I don't begrudge Ming or Hannibal Lector the occasional bot mot.
I can understand not like the Mirror Universe, but as far as I can tell Discovery is using it as intended.