6. Motive. Assad is winning the war. He had no reason to resort to desperate measures.

7. The alleged attack occurred in an area that isn't even being contested at the moment, and that has no special strategic value.

8. Late last year the Syrian government was victorious in a years' long battle for Aleppo, Syria's largest city and an extremely important strategic center. Despite the high stakes in that pivotal battle, Syria never used prohibited weapons.

9. The USA and Britain lied before about WMD, in order to justify their military attacks against Syria's neighbour, Iraq. 

10. Not a shred of independent evidence has shown that there was a chemical weapon attack, or how it came about.

There seems little doubt that civilians died after being exposed to some chemical in Khan Sheikhoun. What is very much in doubt is that a chemical weapon attack by the Syrian government was responsible.