I find it very telling that Tamsyn Muir, who came up through this hellsite, wrote books where the evil emperor starts out as a basically okay leftist millennial tumblr user.
What makes the villain the villain (inasmuch as it's useful to examine TLT characters through that kind of simplistic lens) is that when the chips are down and he has to choose, his priority is punishing the wicked, not saving the people left behind.
I would invite anyone whose engagement with their cause consists of finding the 'correct' group of people to hate, to consider whether 'evil emperor' is the next career move you see yourself taking, and if it isn't, to gently suggest disembarking from the hate train.
Because no one wants their God King to be a tumblrina called John.