It seems that no-one fired at MH17 - not the Kiev government, nor the pro-Russia rebels, nor Russia itself. It would therefore be in the interests of all three parties to start examining the wreckage for evidence of mechanical failure, bomb, etc. (After all, hasn't the world been on high alert recently for warnings about a plane being targeted?)
The fact that all three aren't co-operating to get investigators to the site as quickly as possible suggests to me that not one of them think it was mechanical failure or a bomb. Why are they all so sure?
If nobody shot at the T7 then how come the wreckage has shrapnel holes?
Also how come the USA IR satellite saw the missile plume. And the AWACS over Romania watched it happen?
And why were the Russian militia claiming to have shot it down on Twitter and in a phone call?