Many governments have been responsible for the deaths of innumerable innocent people, including very much indeed the US (and UK). Very rarely indeed do they subsequently admit their guilt, even less often do they make any serious efforts to undo some of the herm they have done.

That is shameful, and it should be challenged. But it should never be used as a reason to block moves towards reducing the danger of war.

It's a complicated world. Right now the major threat is ISIS. In that context Iran, and for that matter Hezbollah are very much on side.