Problem, reaction, solution.
Create a problem, which you know will generate a reaction demanding a solution, and be prepared to offer the solution as soon as the demand appears.
You look like the winner.
False flags are more common than people think.
There was no reason for Assad to use chemical weapons. He was winning. He would know that he would bring the opprobrium of the world down on him, with a likely reaction to marshal military forces against him.
Penetta stated last fall that the rebels had chemical weapons.
Who supplied the weapons materials? Did countries from the West?
The US supports the rebels and they needed to do something to prop up the failing rebel effort.
They were stymied in providing arms because of Benghazi and the fiasco that happened there. As a result, the smugglers were told to lay low.
We did Assad ask the UN investigators to stay longer?
This is a set up just like the Chicago Mob would do it. It makes no sense, otherwise.
We also need to take our Assad because he would not approve a Mideast oil pipeline for the benefit of Saudi Arabia and the Gulf States.
In all things, follow the money. There are primary reasons and secondary reasons.
Otherwise, why does anyone care who is in charge in Syria.