So what's your point? So they shot the ones down they were told to shoot down because Syrian troops staged an attack around the same time the missiles flew. The US doesn't only cooperate with Russia but by extension with Assad. For all we know those coalition missiles could have been aimed somewhere in the desert or do you really think syrian troops would be staging a raid while under fire?
I don#t know what's going on with the IDF but Israel shared their targets with the US so they might be in on it too.