I'm not hating on Russia here, but why oh why would anyone in the Ukraine shoot down a commercial flight over their own territory?
It looks, now, and has always looked, like this incident has its roots somewhere in Russia - either through very poor control of war assets or a direct attempt to create a horrible scenario with the hopes of trying to blame it on "someone" in the process of discrediting them.
The propaganda continues to flow like mother's milk, and people continue to suckle it like babes. Just to borrow a phrase from somewhere...