I would consider it misguided to assume that one can determine whom to trust and whom not to trust based on whether or not their logo appeared on a slide leaked onto the internet, yes. I would also consider it misguided to implicitly believe stories that conform to any particular ideological bias, because misinformation, manipulation and deception can take place everywhere.

It leads to things like people implicitly trusting DDG because they weren't on the PRISM slide, or implicitly trusting Facebook and Reddit because they aren't the "mainstream media."