I'm not much interested in the political sided comments in this thread.
The first things of interest are the examination of the wreckage by skilled investigators and parallel assessment of ATC tracks and any possible missile tracks.
From my view there is little the untrained rebels can do to destroy all the evidence either by intent or accident. The issue now is the ability to put trained investigators on-site and for the soldiers to keep their distance and prevent looting by others..
Meanwhile the first level mitigation is to avoid war zones where missiles of this capability may be operating.
After the confirmation from on-site the political aspects can be explored in some other forum.
Has anybody heard what the makeup of an investigating team will be and when they will arrive?
I would hope that the russians will be involved as well on this team.
right now we need facts not suspicions of motives and recriminatons