original point brought up was that safety is not guaranteed on any of the Xianzhou ships

Which I argue would make no sense for Vidyadhara dissent faction to even be dissenting because it doesn't seem like they actually have a functional alternative to sticking with the Xianzhou Alliance.

Dan Shu wasn't a Vidyadhara

Oooh. I assumed she was given she was head of 丹鼎司, but OK, that puts things into perspective.

Dan Shu's specific trigger for going nuts/evil was that her best friend was a field doctor who wasn't on the frontlines of the battle, but was still caught in the collateral damage of the nuke.

She sounds like she lost all logic and is lashing out. Basically an unhappy citizen with no solution to the problem so resorting to terrorism.