As an SLF I view the airline that I pay a ticket to, and their employees as the people primarily responsible for my flight safety, not the "government" or "rebels" in a civil war.
Siberia Airlines Flight 1812 demonstrated that Ukraine had high-altitude missiles systems and little discernment about how it used them; as such it should have been avoided during a well-publicized conflict.
Political trolls here can claim as much as they want that it was Putin's fault for providing the missile or Ukraine's for not closing the airspace, in the end it was Malaysia Airlines who chose to send their plane straight over a civil war zone, and the pilot chose to accept the route.
Edmund