Patrick Chase
If you dismiss every source that contains at least one factual error then you'll rapidly end up with exactly zero trusted information sources. If you apply that standard uniformly then you certainly can't trust yourself, as like all of us you have been fallible in the past.

Also, abrasive/stone preferences are about as subjective as they come. One person's "best stone ever" can easily be another's "mediocre", and yet they may both be perfectly accurate albeit judging on different criteria.