"You seem to be the only one disputing that an attack occurred."

I guess you and I are reading different articles and comments.

It seems likely that a chemical weapon was released in Khan Sheikhoun, killing 80 people. There are a number of scenarios that could lead to such a release, and no one has offered a shred of evidence that the chemical weapons were deployed by the Syrian government. In fact, many observers are pointing out sound reasons why the Syrian government wouldn't take such a step.

I repeat, there is evidence that a chemical weapon was released. There is no evidence being offered that the Syrian government used it in an attack.