Bear in mind that this can happen here on Bitcointalk too, as we post with different degrees of knowledge, and this evolves over time (it could de-evolve too as a matter of fact).
You're correct, but I think the difference here is that wrong information posted in Bitcointalk forum more often than not is corrected, if it's an OP who made an error in their post, subsequent users' replies would correct the falsities, if the mistake is from a reply, users who see it would also put the poster in the right way by correcting such mistakes, I think this is far much different and better than when a newbie all by themself is reading an article online which is wrong with no one to tell him/her that what is being read contains some erroneous information, such newbie would take that info hook, line and sinker, and carry it along till someone along the line prolly makes the necessary corrections.
This means that, even within Bitcointalk, if something is important to you at a given moment in time, it’s best to contrast it through reading answers on multiple threads and/or asking anew (preferably, having gained some prior background on the matter at hand).
This method would likewise work to adequately filter wrong from right information.