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Remember the bumper sticker, "question authority"? It started being popular in the late 70's, and pretty much goes along with the generation that probed, then probed again.
Any time one questions instead of accepting "conventional wisdom", the brain is used globally. To use your whole brain is a good thing, and quite sane…
The reason you see comments on the hostile side, conversely, has to do with a narrow minded, limbic brain reaction. This, IMO, is the kind of response you'd get from persons who, upon frustration, uses less and less of their brain.
They're everywhere… so they're well represented here… 
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