In late June, Seymour Hersh published an article in Die Welt claiming that the Assad government did not attack the town of Khan Sheikhoun with sarin on April 4. His argument aligns with a popular left narrative about American imperialism falsifying or exaggerating events in Syria to justify intervention and regime change.
For example, many commentators — Jonathan Cook, Uri Avnery, among others — have wondered why Bashar al-Assad would use chemical weapons when he was already winning the war. The attack seemed not only unnecessary but also likely to spark a harsh international response. [...]
Indeed, as Anne Barnard reported, the sarin attack fits into Assad’s broader strategy. She writes that, since at least 2012, the Syrian government “has adopted a policy of seeking total victory by making life as miserable as possible for anyone living in areas outside its control.” These attacks are designed to let the opposition know that it remains at the regime’s mercy, that neither international law nor the international community cannot protect it, and that surrender is the only option. [...]
A further problem with the “there was no reason for Assad to do this” argument is that the same argument could be advanced to explain why Assad would not have done many of the things that he undoubtedly did do. Why did he need to use barrel bombs, which so enflamed world opinion? Why did he use chlorine gas after he committed to a chemical weapons treaty that prohibits it? Why did his forces return to bomb Khan Sheikhoun just days after the American missile strike? Why did his forces and allies advance on an area protected by the United States? Why did a Syrian warplane drop bombs near American-backed forces and their advisers? [...]
For example, they continually bomb hospitals in Syria. The unanimous reports from international human rights groups about Russian and Syrian attacks on medical facilities have certainly turned world opinion against them, but Putin presumably calculated that he would face minimal consequences for them. He was right, and much of the global antiwar movement remained silent. [...]
Second, no evidence suggests that any jihadist groups possess sarin. (Chlorine or mustard gas, which are not nerve agents, do not become sarin when bombed.) The UN and the Red Cross have documented ISIS’s use of mustard gas, but never nerve gas. Even if ISIS had gotten its hands on sarin, they are not present in Khan Sheikhoun. [...]
If we accept the Russian and Syrian claims that jihadists have used sarin — claims that neutral observers have rejected — then we end up with another incredible result: rebel sarin never harms Assad forces, only rebel civilians.