> Dany has shown a pattern of burning her enemies. Her enemies. Those that betray her, enemies in the field who don't bend the knee.
And people who by situation of birth are in a group whose way of of life conflicts with her moral preferences, even if they've never personally wronged her or owed her a duty of allegiance, c.f., Astapor.
> Yet every time the thought of killing innocents comes up, she's gone extremely out of her way to avoid it.
To the extent that’s even arguably true—at least, after Mirri Maz Duur in S1 (the negative results of which are the impetus for the one Stark example of Dany’s character development)—it was directly tied to a belief that she was loved (either personally or as a leader by the masses or, most often, both) and that acting otherwise would undermine that—a factor which very much was not at play in the attack on King's Landing.
And she's made very clear since very early on (though it's clear her practical expectation that this duty would be fulfilled has evolved over time) that she feels the masses of Westeros (and therefore those of King's Landing) do owe her a duty of loyalty that they betray by obedience to anyone else. It also made clear that her relative restraint was due to the restraining influence of a particular set of advisers and allies, all of whom were either dead or seen as betrayers (the latter—and in one case also the former as a direct result—in a couple key cases in part largely because their confidence in their ability to continue to restrain her impulses was slipping for reasons clearly shown in the narrative) by the time of the attack on King's Landing.
And people who by situation of birth are in a group whose way of of life conflicts with her moral preferences, even if they've never personally wronged her or owed her a duty of allegiance, c.f., Astapor.
> Yet every time the thought of killing innocents comes up, she's gone extremely out of her way to avoid it.
To the extent that’s even arguably true—at least, after Mirri Maz Duur in S1 (the negative results of which are the impetus for the one Stark example of Dany’s character development)—it was directly tied to a belief that she was loved (either personally or as a leader by the masses or, most often, both) and that acting otherwise would undermine that—a factor which very much was not at play in the attack on King's Landing.
And she's made very clear since very early on (though it's clear her practical expectation that this duty would be fulfilled has evolved over time) that she feels the masses of Westeros (and therefore those of King's Landing) do owe her a duty of loyalty that they betray by obedience to anyone else. It also made clear that her relative restraint was due to the restraining influence of a particular set of advisers and allies, all of whom were either dead or seen as betrayers (the latter—and in one case also the former as a direct result—in a couple key cases in part largely because their confidence in their ability to continue to restrain her impulses was slipping for reasons clearly shown in the narrative) by the time of the attack on King's Landing.