Yep -- no doubt about most of that. However, that doesn't address those who become convinced they've got the solution.
Absolutism in people is another thing. Having a great degree of self confidence is desirable; have a great degree of certitude is less so. The guy with self confidence listens to and learns from others improving his and their lot; the certitudinous don't listen because they already have all the answers (or they listen but discard immediately). They're dangerous. See McNamara, R.; Rumsfeld D. for examples.
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