By the way, it's stupid to talk down on hate or criticism against Caitlyn by comparing the reception of her to the reception of Viktor, and saying "What he did is much worse so why doesn't everyone hate him as much, huh!?"
Because Viktor's actions are almost entirely fantasy. He gets brought back from the dead against his will by being fused with a malevolent magical item beyond human comprehension which deludes him into thinking that turning people into lifeless husks is actually healing them and creating his dream utopia, and then later turns their dead bodies into mannequins after being revived a second time through blood transfusion with a dead wolfman. Then he becomes a virtually all-powerful being who stuns everyone for about 5 minutes before letting them go because the guy he's obsessed with who's also obsessed with him reaffirmed their obsession for each other and decided to leave everyone and everything behind together in a bright flash of light.
While you can compare Viktor's actions to real life, ultimately the conclusions will all be thematic, symbolic, allegory, and/or metaphor. Abstract, essentially, which are not very severe or serious in audience's minds because nothing that Viktor actually did is possible or has ever happened in real life.
You cannot say the same for Caitlyn. Everything Caitlyn has done has also been done in real life, repeatedly, throughout history and across the globe, so the severity of what she does hits much harder. She was willing to traumatize or risk the injury or death of a child who had nothing to do with the objective or her grief, just to get to a target that was already surrendering and was also pinned down in place by said child. She was willing to risk injuring Vi, her girlfriend, who was actively trying to block her shot, and then later on hit Vi with the butt of her gun, in a spot where Vi had already been seriously injured previously, during an exchange that was not violent up until Caitlyn herself made it violent. She brought together a group of policemen and routinely took them down to the poorer sections of the city, liberally employing poisonous gas that is known to permanently disable and even kill people, all in order to hunt down a mentally ill girl who couldn't be older than 20. She accepted an arbitrarily appointed position as military dictator, and under her authority, the police and foreign soldiers brutalized civilians, arrested people without formal charges, and sent them to a maximum security prison that is isolated on an island surrounded by rocky waters — all of which included a child, by the way. During all this, she became close to and slept with a subordinate. Then once again using the butt of her gun, she attacked a civilian without even knowing who they were, why they were there, or what they were doing, when she could have just stopped them and asked; made all the worse when that civilian turned out to be Vi. And I'm not even going to get started on the damn sex scene.
That isn't even all of it, but we would be here all day if I made an exhaustive list. The point is, you will find people in the real world who have actually done what Caitlyn did. You will find real people in the real world who were or are victims of abusive partners, exploitative bosses, predators, manhunts, war crimes, police brutality, and military dictatorship. Many of them would be watching this show too, and many who weren't even personally victims of these things would at least be knowledgeable on them and recognize their weight. So of course a lot of people would come away from the show not being fans of Caitlyn or Caitvi while simultaneously feeling indifferent to positive about Viktor. To compare them would be like comparing food to stationery, they're just not the same thing. At all.