In the end, Astaria and the others decided to follow Erotica's words.
Yes, they decided to abandon their people and run away. A choice Astaria absolutely hated, but honestly, this was the only choice she had.
Out of all of them here, only her, Riona, Ember, and Evane were the ones who actually wanted to stay here and protect the people.
Amaya's thoughts were simple, if it is not about Nux, she won't care and something that could put Nux at risk, there is no way she would agree to do something like that.
Thyra was an Assassin, others dying due to her actions has never really scared her, she had zero sense of responsibility for anyone who is not Nux.
Allura, Edda, Skyla, Lane, and Felberta, were the same as well, they never cared about the people, well, they did, but not to the level where they would sacrifice their own life for them.
They were not that noble.