If it was not Paul Graham this would never has made it to HN front page, but ok...
One of his point is that people should not talk about things they don't know about. So maybe he should start applying that to himself first (and maybe this to myself right now).
The question is, how do you define the threshold of expertise require before you start talking about a subject?
The concepts of truth, credibility, ethics, deontology that he vaguely puts the finger onto. Those are complex topics, still being studied and will be forever.
Blaming journalist and politics, why not, I guess some of them deserve it, but my neighbour could have done the same analysis after couple of pints at the pub.