Various cases of NPD online. The NPD-afflicted individuals usually are too arrogant to study or do anything difficult where they can measurably fail, and instead opt to blog on the topics where they don’t know the fundamentals, promoting misinformed opinions. Some even live on donations for performing work that they never tried to study for doing. It’s unclear what attracts normal people to such individuals, but I guess if you don’t think yourself a supergenius you can still think yourself clever for following a genius whom you can detect without relying on such ordinary things as credentials or achievements, as described here.
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One basic thing about MWI is that it is a matter of physical fact that large objects tend to violate ‘laws of quantum mechanics’ as we know them (the violation is known as gravity), and actual physicists do know that we simply do not know what the quantum mechanics works out to at large scale. To actually have a case for MWI one would need to develop a good quantum gravity theory where many worlds would naturally arise, but that is very difficult (and many worlds may well not naturally arise).