> And her dragon and Grey Worm dont even try to avenge her?
We know that dragons aren’t stupid but we’ve never learned how intelligent they are exactly. If we assume they are about "dog intelligent", then it’d make sense that while Drogon gets that his beloved mother is dead, he simply can’t come to the conclusion that she was killed by Jon. However – the writers destroyed that assumption since Drogon, the way he roared at Jon, obviously knew what happened there. AND of course followed by burning down the throne which implies he is even capable of symbolic acts.
So basically it’s down to the explanation that he won’t burn a Targaryen no matter what. I’m not saying that this is a good explanation, but I guess that’s what the writers had in mind.