Once again, you're not reading people's posts properly. Nobody's attempting to 'attribute shaky video to a potential fighter jet being present' (can a 'potential' fighter jet be 'present' anyhow? Sorry, cheap shot. :D ); we're just speculating.
With regard to the upward movement of the camera, I don't buy your explanation. The camera operator clearly has the plane's trajectory in sight, so any upward movement is just unnecessary - in all likelihood it's just bad amateur camera-work, admittedly, but the additional 'plane' noise does seem consistent with (reliable? anybody's guess) eyewitness accounts from the scene. Again, this could be anything.
As for that being the last remnants of the plane and not the bulk of the wreckage, from where did you get that information?
Also, the '312' BUK was
most definitely the one featured in the Kiev junta's 'damning' video evidence of Russia supposedly arming the rebels. Have a look.
I'm afraid 'crappy Youtube videos' are pretty much all we have in the absence of ATC records and so forth, in a region that has been totally destabilised by different foreign influences and is the subject of impenetrable propaganda. That's why we're speculating. Sorry if this offends you.
Or have you dropped the Tory Troll schtick in favour of Obama Troll?
EDIT: It appears the flight recorders have emerged anyhow. Not sure how much we'll learn from them, but it's proper evidence at the very least. Now let's see what Ukrainian ATC do about their own records. I'm not holding my breath.