I hate to be "that guy," but if anyone thinks George R.R. Martin won't have Daenrys burn down King's Landing with Drogon, setting fire to soldiers and civilians alike, then you're in for a rude awakening. Even though we definitely argue that D&D botched the execution of Dany's heel turn, not only did GRRM plant the seeds early on in the books, it's a twist that totally aligns with A Song of Ice and Fire's stance against war, monarchy, and absolute power.
Exactly! Which is why what she did is so horrific. She's arbitrarily deciding who's guilty and innocent based entirely upon how much they're willing to "bend the knee" to her. Her entire approach to ruling has always been "You're either with me or against me. You either join me or die. You either reconcognize me as your true queen, or it's fire and blood." We and her followers excused what otherwise sounds very much like the actions of villain because we and her followers convinced ourselves that Dany's enemies "deserved it." But the entire point George R.R. Martin and Game of Thrones is making is that no one "deserves it."
I'm also guessing during the finale, if Tyrion or Davos or Jon calls her on burning thousands of innocent civilians, she'll not only rationalize it with the whole, "They had their chance to rebel against Cersei long before I arrived," she may also argue that the deaths of countless women and children are on Cersei's hands because she decided to use them as human shields. She may even say that, by burning King's Landing, she now ensured that no one will dare stand against her or betray her--because now they know what will happen if they do. And if this sounds eerily familiar to real-life leaders, that's also the point.