Honestly, respect to the people in here who thought last night's episode was executed well. You genuinely gave more thought to Dany's motivations and what was going through her mind than the showrunners did.

Seeing the castle that she never lived in (for at least the second time) is what made her impulsively kill thousands of civilians? THAT'S what did it?

Again, the problem isn't Dany is a villain now. I absolutely believe that's the direction she was always going to go eventually. It's that *this* was how they did it that.

https://www.cbr.com/game-of-thrones-daenerys-villain/

Lastly, Weiss made it perfectly clear her descent into madness at the battle of King's Landing was totally impulsive and not premeditated as many believe. "I don't think she decided ahead of time that she was going to do what she did. And then she sees the Red Keep, which is to her the home that her family built when they first came over to this country 300 years ago," he continued. "It's in that moment, on the walls of King's Landing where she's looking at that symbol of everything that was taken from her, when she makes the decision to make this personal."