Invitations and Becomings

I've been a big advocate of wikis and in particular Wikipedia for a long time now, and during that time, I've always argued that you can't discredit Wikipedia by exposing factual errors, for the simple reason that - with enough contributors - exposing an error is practically equivalent to fixing it. In any case, there's no formal distinction to be made between reading and writing Wikipedia (that's the point!), so you can fairly ask any critic who finds an error, why they didn't just fix it. (Let's call that the well-fix-it-dear-henry argument).