Does anyone expect him to come right out and admit it? His days are numbered. We don't want to bring him to justice. We want to bring him to death, and all his scum bag friends, and those who harbor them. We know who harbors them too. I imagine they are already looking to the sky, for a fearsome show of judgement.
Why wouldn't he? What fear does he have of being caught? How do you know he actually exists? The FBI says so? "Kilroy was here."
Was there ever a guy named Kilroy? Was there a real Uncle Sam?
Anyone effectively responsible for coordinating mass murder isn't going to morally scruple over lying.
I agree with the folks that are speculatively drawing a connection between this terrorist incident and China's designs on Taiwan and geo-political ascendancy. And if the Chinese are somehow not involved, it can serve their purposes anyway. Somehow I can picture Chinese pilot training for the terrorists.