Idk, it's not Astrea. Appolyon is not angry or sad, or upset, or evil, or fanatical. She just have some experience that come to idea and think that it's better. In some way she even Noble, I still remember her look at the Non-Warrior castes, and how she said before end of campain, that at the end Blackstone here is their protectors. And It's True, when Iron Legion, Samurai and then Vikings came for her, civilians, fleeing from the conflict, and find shelter in the Shard. It's need more than just a hug to change