It's all a matter whose story you gonna trust:
a) someone who stands to lose everything and gain nothing by using chemical weapons, and who incidentally has no credible record of ever using one
b) someone who stands to gain everything and lose nothing, and who incidentally does have a record of not only of using chemical weapons but is also quite fond of publicly using women and children as human shields
Wow, that's a tough one. A real head-scratcher.