I agree with you. Even if Assad did it, I am not in favor of striking Syria. But lack of clear culpability on the part of Assad may be a consideration for members of congress who are sitting on the fence with a finger in the wind.
Seems to me the rebels, who apparently were losing, had a far greater incentive to do it than the Syrian military.
There’s no reason for us to be in Syria. No threat to us, no national interest, nothing. The fact that congress critters with their fingers in the wind need to be told the right thing to do is a disgrace.