So the U.S. and its allies are using their own “evidence” and will come to their own conclusions, likely much faster than the UN is able to investigate. Obama will then say that Syria poses an “immediate threat” and that there is no time for the UN to investigate. It’s sadly predictable; we’ve seen it all before.
Of course, the Obama administration and its anti-Syrian allies cannot act as an objective party in this matter, since they have been directly backing the Syrian rebels. Nor can Obama be trusted that his “evidence” that was “smuggled” out of Syria is any evidence at all. Again, this is why there is the UN: to perform an impartial investigation. Even if there were evidence of a chemical weapons attack — which looks likely — such evidence doesn’t say who launched the attack, which, of course, is the key issue
Of course the above is obvious to anyone thinking for themselves.