Metacrap: there are indeed real and often unrecognized reasons why metadata hasn’t taken off.
People are lazy and stupid are bad analysis (is that a plural?) of these reasons: people aren’t lazy, they are just not interested in tagging metadata to stuff if they don’t see an advantage to it: what’s in it for the authors?.
People lie is an obvious one. Know thyself is where it gets good, another good one that isn’t understood by many people starting out in the metadata world is that schemas aren’t neutral. The conclusion (implicit metadata, like Google’s analysis of links, is more useful) surely has some truth to it. Interesting. Maybe the whole idea of having people tag their stuff with metadata is deeply flawed?