Georgiou wasn't welcomed either. She was an albatross around Burnham's neck, in a very figurative sense.Hmm, I will rewatch "Errand", but I just cannot equate Mirror Georgiou and Kor.
And, I agree about the "our bastard" - that is why we sometimes can (but probably shouldn't) work with bad guys (both in Trek and real life).
As for working with Dukat as an ally - I think the only time we did that was when the Klingons had "illegally" invaded Cardassia playing right into the Dominion's plans. And even then, nobody welcomed Dukat as anything more than a representative of an attacked nation - unless I am forgetting something.
And even if Kor and Georgiou can't be equated, the Klingons go from an oppressive power to allies, and Kirk is wrong constantly (as presented) for not trusting them. The point of Star Trek is that enemies can become allies, that humans can become better if given the opportunity to grow. Call me hopelessly naïve but I love Georgiou for exactly that reason. I may not trust her, or work with her, but the fact that she is able to come face to face with her past life and realize how fake and fraudulent her relationships were, and how much she has changed is fully in the spirit of Trek for my money.
Yes, Michael should have never worked with Georgiou. But, there emerged a radical change and I'll take that storyline any day.