I think what Earthbound meant to say was that although WikiPedia can be edited by anyone, most of the stuff found there can be judged by a sensible reader, if they have a bias or not.
For that matter, why should other sources be placed on a higher pedestal over Wikipedia? Just because it can’t be edited by someone other than those whom the webmaster allows? What if the webmaster is biased, to begin with?
Nailed it.