of course, russian govt is the most knowledgeable - they shot down the damn plane.
on the other hand, the rest of the world knows quite a lot - photos and videos on the ground, showing buk system moving around, intercepted terrorist conversations that include receiving of the buk, moving it around, then scrambling to react when they find out just what they just shot down.
that also includes public bragging about downed ukrainian plane, only to hastily remove all those comments once they figured out that it's a civilian plane.
after that they publicly try other idiotic statements like claiming that all passengers were dead in amsterdam already (yeah, happens in that city every now and then, right ?), or trying to find "weapons" in the remains of the plane.
then more intercepted conversations where they are given the orders from the "higher ups, from moscow, you know what i mean" not to let anybody who's not "theirs" near the crash site and above all - find all "black" boxes and ship them to moscow.
there is no "anti red agenda". there's a fascistic, aggressive country that invaded and annexed part of a european country. and there are lots of paid commenters who try to whitewash the crazy actions of russian state. (although some might be genuinely crazy and/or uninformed and do it for free)