This is indeed the problem. The Russian government (and tbh, all others involved) can - and will - continue to shift the blame. First it's a Ukrainian fighter jet, then it's not a Russian-made rocket, then it's Ukrainian 'rebels', then it's pro-Russian separatists they have no control over, then it's not their fault the recently-dismissed-from-Russian-army people shot down the wrong plane, and finally what were commercial planes doing there anyway?
( Hint: That's already the debate in various lawsuits against companies and governments other than the Russian one - as even the family members of victims realize Russia's covering their ass all too well. )
So the report's conclusions - which apparently need political debate to finalize - really don't matter much.
In the mean time, Russia imposes sanctions against countries involved in investigations leading to bankruptcies left right and center (oh right, that's why the conclusions need political debate), vetoes any U.N. proposal they dislike (the U.S. does much the same in other matters.. can't blame them for that one - too bad there isn't a cap on the number of vetoes votes one can cast per given time period), and happily go about business as usual knowing that in the end, this is barely even a blip on the radar in their history - much the same as Korean Air Lines 007, Iranian Air 655, Pan Am 103 (might ring a bell under 'Lockerbie ') and many others.