She hadn’t achieved complete victory, she wasn’t killing random people for fun and she was very much solving a problem.
What did Dany think would have happened if she had accepted the people’s surrender?
She didn’t know about Tyrion’s plot with Jamie at that point. So she she would have expected something like:
- Lannister armies are disarmed, marched out of the city and put under guard.
- Townspeople are generally allowed to get on with their lives subject to them getting out of the way of
- A brief siege/negotiation with the Keep/Holdfast to ensure Cersei’s surrender. If unsuccessful, there would be a bit more highly targeted dragon work. If successful, then presumably some sort of execution, with or without trial.
Fine. But then what? In theory, she mounts the Iron Throne to the acclaim of her new people. But she knows that’s not actually going to happen because she is neither loved nor trusted. Instead, there would be conversations. A Small Council. A Great Council. Negotiations. And would that end with her on the Iron Throne, ruler of the Seven Kingdoms? Her own advisors are ambivalent; her closest supporter has a better claim to the throne than she does; this is widely enough known to be a problem; Sansa Stark and other nobles don’t trust her; all would prefer Jon; she has lost Jonah, her loyal Westerosi follower of ages and Missandei, her diplomatic spokesperson and friend. She has no “soft power” - no diplomatic moves, no network of relationships, no bribes to offer, no personal status beyond being the person on the dragon. She does, however, have a dragon.
If she follows the path of peaceful negotiation, allows herself to be guided by advisors, attempts to build consensus, or tries to negotiate her way to the throne she will fail. She sees that very clearly. She is so close, and could lose all. If she is to rule, as she said earlier, it will be through fear rather than love. If she wants Westeros, she must take it now, with fire, before it is snatched from her. Should she rely on Tyrion to open her path to the throne? Will Jon lead her armies North to bring Sansa to her senses, or will he once again betray her for his family? There is no one she can depend on and no-one she need depend on. Let them see here and now who Daenarys Targaryen really is. Let them know who is their true Queen. Time and again she has listened to her advisors tell her she cannot simply take power; time and again she has suffered for it. Time now to show how a Targaryen rules, how they have always ruled. Fire. And blood.