I'm failing to see your point. I gave Einstein and Planck as examples of people who made categorical negative but wrong statements and later admitted they were wrong (without, incidentally, incurring a "credibility cloud"). You seem to now be saying that it's OK for the likes of Einstein and Planck to do this, but everyone else should be humble?
> Now this "corollary" needs somewhat more evidence to convince that naysayers are a necessary (or necessarily positive) factor in innovation.
A corollary is a logical deduction from a proposition. If there's enough evidence to support the proposition then, ipso facto, there's enough to support the corollary.
If you think the proposition needs more evidence, there's enough in google to supply virtually any amount of it going back to the beginnings of recorded history.
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