On the other hand, did the Trump Administration invent the existence of Assad's sarin gas, which NSA McMaster “believes” may have been stored at the airbase Trump destroyed?
Everything we “know” about this incident was stated by or filmed by unknown sources from Syrian “monitor” groups, or by unidentified US or Israeli military sources.
We have no verification that sarin bombs exploded in that area and no verification that, if sarin was used, that it belonged to Assad and not to the Al-Qaeda group that was being attacked.
Trust, but verify.
So far, Trump's story is all trust, and no verify.
The article states that “sarin use was confirmed” in so many words, yet I’ve neither seen anything remotely-resembling any such confirmation...
What sort of evidence would you define as conclusive, if any?
I’m certain that no matter what evidence is provided, the goal posts will simply be moved to render it unacceptable, because opposition to intervention in Syria has nothing to do with what Syria does or doesn’t do, only what Russia wants or doesn’t want.