Why people think they know who, what they are, why they are here and that what they do is right?

Why people think they know who, what they are, why they are here and that what they do is right? Be logical, give proofs, ready to listen, no matter how long
Why people think they know who, what they are, why they are here and that what they do is right?
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Be specific, give knowledge, don't Just throw anything, nothing religious, nothing known, nothing naive
Why people think they know who, what they are, why they are here and that what they do is right?
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