Reasons for war?

I still haven't listened to Obama's speech (though I'll certainly read summaries, if not a transcript), and it's sure that the US media isn't talking about this, but it's kind of important.

So far, we haven't heard any evidence that doesn't amount to "trust us", and that's a bit of a problem.

Especially when we find out that our allies aren't quite as convinced as we are.  The lede is pretty straightforward:

Syrian government forces may have carried out a chemical weapons attack close to Damascus without the personal permission of President Bashar al-Assad, Germany's Bild am Sonntag paper reported on Sunday, citing German intelligence.

Kind of destroys any rationale for attacking, doesn't it?