If I read your comment in a different way, I might take it as saying that we should never ever trust anyone who's ever made a mistake (or someone who trusted someone who's made a mistake). I don't think our world can function at all if everyone adopts the same thinking without adequate reflection on content vs. the person/messenger. Of course, there is value in questioning the credibility of a source of information over a period of time when multiple issues have surfaced. But judging an entire blog based on one single post and dismissing that? It neither seems fair nor useful to me.