I imagine they didn't, or they would have done something to save themselves.

[Or they were too stupid to. If Kylo knew some of them had become aware of the clone army's potential to be mentally controlled and yet continued to do nothing, he would think they deserved to be wiped out even more than he currently does.]

But they are destined to be gone, and so they are. [Or nearly.] Others will do the work the Jedi should have done.