A German court is considering the case against Assad and his government for use of sarin.

I have doubts about whether Assad used Sarin. I would not put it past him; he did plenty of killing, and plenty of torture of prisoners. I suppose he would not have had scruples about using nerve gas.

But I can't see why he would have used it only twice. Using poison gas even once, one assumes the full odium of having used poison gas, but gain little military advantage. Since he does not seem to be insane, why would he pay so much for so little?

In addition, Seymour Hirsh said that there was no sarin attack in Khan Sheikhun.

This is a doubt, not a certainty. I am not in a position to reach any conclusion about this. Meanwhile, it makes no difference to what I think of Assad. He is guilty of plenty of other crimes.