The Mirror Universe needs no Khan. The fact is humans were like they are in the Mirror Universe for eons, and happily went along in backstabbing and heinousness well into civilization. Look to Rome or the Vikings, the Middle Ages, and the nasty bits about Egypt and the Greeks. They warred, murdered, enslaved and did really atrocious things as par for the course that the popular history would prefer to forget. And it was simply accepted as something normal, or even proper. The higher up you were, the more likely it was someone wanted what you had, and would cloak themselves in allies and legitimacy when you were pushed out of the picture. The lower you were, the more open you were to abuse without recourse. For goodness sake, for a long time, revenge and letting the parties work it out themselves through murder if necessary, was a legal option. In Rome, and sorry for this nasty subject, rape was something to be dealt with by the family privately, outside the law, for their retribution. Also in Rome, the family was a dictatorship of the pater familias, and the father could do whatever he well pleased in his private dictatorship. In the Middle Ages, there was outlawry as an option in many societies. To be an outlaw did not mean you were a criminal. It meant that you were declared outside of the law for your crimes, and anyone could do anything to you they wanted (say, murder you) and you had no legal protection or rights against it. The Terrans are humans that never evolved morally or socially. Its Game of Thrones in space.