By now, I think it's pretty obvious that the Russian backed rebel were the shooters. My question is, why was a civilian airliner flying over an active warzone
It is far from obvious.
What you posted is 100% presumption.
On 9/11, there were many presumptions, and then one narrative became the "official story". That story was false.
So, please bring forward the research to back up your claim because it is far from "obvious".
The conclusions didn't set out to lay blame on any particular group that is out of the investigators remit and will be dealt with in a separate case.