I don’t doubt that the various US intel agencies can be controlled by swamp dwellers - the political appointees.
However, are you suggesting that all the European and Sunni intelligence agencies are under the thumb of the US swamp rats???
I don’t know if Assad was responsible. If those agencies are wrong about this, the US swamp would not be the only cause. Maybe they based their conclusion on unreliable evidence. What is the evidence?
Ah yes those Europeans and Sunnis that love the US and Trump so much, who wouldn’t believe what they say?