does 'being pushed by people with a hidden agenda' automatically invalidate something? I'd say that that the American (and presumably European) political establishment (both the right and the left) have a 'hidden agenda' of pushing science because it creates a higher authority that they can appeal to justify questionable policy choices. That doesn't mean I think all science is wrong.
It does not invalidate anything, but that's beside the point; it's not about valid or invalid arguments (their first one is almost always valid or defensible), it's about getting into what you might think is a honest discussion whose purpose is to find out the truth, whereas your interlocutor's purpose is to unroll their rhetoric and influence you or the audience, according to their hidden agenda. While you're only paying attention to logic and validity, they win points and convince people around.
