What's actually going on there?
Puts tin foil hat on -
It appears that the USA/UK happened to "accidentally" strike the target. After everything I've seen it doesn't appear unintentional. As the Russians put it - it was at least gross negligence, at worst assisting "ISIS".
If the West can't get Syria, from a strategic point of view, it loses most of the Middle East to Russia and Russian doing a very good job at stopping that from happening.
Meanwhile the West is doing anything at the costs of millions of lives to ensure that does happen.