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One famous example means that philosophers cause "unrest?"
Edit- That sounds rude. I imagine that philosophers either have a stabilizing effect on society or are indicative of a stable society. The more intellectuals you have, the better it would seem. I don't understand how they make states less stable, unless you're talking about inciting revolution. But I think you could make the argument that it's not philosophers inciting anything, but rather people realizing what they have been left without. Does that make sense?
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