Yep, no one is really going to come out and say it, until there is conclusive evidence at this stage.
Also although Russia is acting transparent as hell, which country is going to take up the fight to Russia? Netherlands can't, US won't and Malaysia won't do anything. We've got Abbott in Australia getting into a war of words with Putin, but he's taking potshots from 15,000km away. Russia knows it can act like a bully but ain't no one going to do nothing. And Russia doesn't seem too worried about sanctions either.
By the way, has the theory of a bomb on the plane itself been discussed? I mean it seems we've jumped to conclusions a bit because of a social media post that it was definitely a surface to air missile.... what if it was the intention to have a bomb on the plane go off somewhere around the border...