You're clearly suffering from, in cognitive science terms, what are each called a confirmation bias and a negativity bias.
I'm one of the first people to cynically call out the actions of my own government here, including calling out George Bush before he invaded Iraq for fabricating bogus intelligence data as a pretext for a bunch of military hawks.
But the case here isn't even about what's right or wrong morally -- it's about factual accuracy. You would be just as credible to me as if you stated that the U.S. government supports ISIS or the al-Nusra Front. Because the details don't matter -- clearly you feel the need to believe the truth must fit in a certain way to support your own belief system and you defensively resist any change to that. Even when there's overwhelming evidence to suggest otherwise.