If you kept up with the news you would have known that a pro-Russian rebel boasted about shooting down the plane. Originally Posted by BigLouieIt was also reported that some phone calls were intercepted between Ukrainian and Russian with lots of profanity in the conversation and the bragging was removed from the site shortly afterwards.
As mentioned it was also reported early on that U.S. intelligence has identified the launch location with gps and the type of missile launched, which was not in the "rebel" inventory. U.S. intelligence was only verifying the information.
It would be in the "best interests" of the current administration (with its attitude) to blame it on the rebels, instead of the Russians, so the final U.S. intelligence report may not be consistent with early reporting in which it was stated that the launch was not on Ukrainian soil.