And the ratio of false flag operations to false accusations of false flag operations is about 1:99. Lots of unlikely things "do happen," but if that's the immediate explanation you reach for you're going to be wrong most of the time.
You might want to take this up with that "rdtsc" guy who wrote "As someone else pointed out this is a classic false flag operation." He seems to disagree with you on those points.
Oh right, I know him! He is a decent fellar. I think he was saying if US is attacking its own infrastructure, then a false flag operation is a plausible explanation. Talking to him a bit revealed he didn't say this US attacking itself.