IF he had had them, I suspect he would have used them. He knew if we hit him he was a dead man, so why not?
Our war effort was based on the expectation that he would use them and he did not. So maybe he did not have them?
At the time he was de briefed he knew he was going to be executed, just like his sons were killed. He was still perplexed as to why the US wanted to help, however obliquely, the Iranians become the strongest power in the Gulf region. It made no sense to him. He admitted he misjudged our intentions. He was hoping the arms inspectors would give him a clean bill and at the same time he could continue bluffing the mullahs from Shialand. He misjudged things.
He was a disaster for Iraq and there is still hope, however slim, that they can get their act together, so in the long run the Bush gamble may pay off.
The situation with Assad is somewhat different because of the support he gets from the commie and ex commie baddies but he is encircled by enemies and does not have a lot of wealth to draw on.
Obama seems to be playing out W's hand: splatter any available target in the middle east and hope for regime change and maybe things get better later. The states of the middle east are so different from each other and so splintered internally that maybe, but only maybe, someone might get a leg up and serve as an example to the others.
Best bet would be Lebanon if they can be rid of the Alawite overlords and evict the unwanteds from the country.