Dumb headed. Who really hears them anyway?
Literally everyone.
1) The question about who exactly gave the order to shoot down the plane is less important right now, a crime at this level will not be judged over a person, it will be on a group/community or command level , so will be conviction and sentencing or acts towards it.
2) There are sources which have revealed communication between Rebels and Russian officers.
3) Did they know or did not, that is the most pertinent question here, if they have shot down a commercial airliner just to test their MTS and radars then that means very close to war. If not, then its questionable in multiple areas..such as
a) How the hell the airliner decided to set a route over a marked war-zone where multiple military planes were shot down using SAMs.
b) The pro-Russians who allegedly has shot down the plane are actually the separatists or is it Ukrainian rebels or pro-euro revels weaving a conspiracy to make it look like Russians did it. Plane flying over Ukraine, separatist looking dudes take it down. Simple but big.
c) If the above is true, why pro-euro rebels would shot down a plane which had mostly "Europeans" ?
d) Russians are in the deepest shite here, They are not the holy paladin of righteousness , they sell weapons across the world. Reports has a sighting of a Buk missile system moving between the cities of Torez and Snizhne, both within in Donetsk Oblast area few hours before the plane was shot. If Ukrainian separatists have just blown up a commercial airliner using a Russian weapon, we are almost certainly looking at a massive geopolitical chaos here, with the rest of the world too.
e) BUK has a range of 22Km above surface upto where it can detect targets, detecting a subsonic target at 33000 feet was too easy for it. Even if the plane had gone above stratospheric heights, the missiles would still blow it to pieces.
And lastly it does not matter whether US is hot headed or cool-ass because what matters is information, and they are bloody damn good at it. If it turns out that Russia has really got bloody hands, then it will totally justify their recent actions over Ukrain and call for a war.