There have been witnesses who reported the presence of the BUK system in the area at the time. You choose to ignore them. There are pictures of BUKs with their numbers painted over in both Russia and eastern Ukraine. Why would the rebels and/or the Russians hide the identity of such military equipment? There are fighters on both sides who have killed civilians. Why would large numbers of civilians report what they have seen, knowing the wrong story could get them killed by either side?
I spoke about very, very loud noise.
Nobody heard it!
I can read Russian and I may declare, that Russian facebook (v kontakte) is FULL of photoshop FAKES at both side. The similar war like on the ground goes in the internet.