Roots
It seems to me that whatever the technical issues that affected this accident, there is something deeply wrong about the very idea of a virtual airline, with contracted in operators serving the schedule.
I have worked at the bottom of the heap in shoestring turboprop operators (thankfully a long while ago now) and that was cowboyish enough, and they were overseen by the CAA and were "respected regional operators" - though not by their employees it must be said.
I will want some convincing that the roots of this were not in the very model of the airline itself, with operators working on thin margins and even thinner training programs. You just don't want to be on aeroplanes like this, either as pax or crew.