I don't think that that is an important distinction. Most of the effect I was talking about is that it is easier for something reasonable (something with a relatively large probability of being true) to make the jump from controversial belief to generally accepted belief. Once something is generally accepted and people stop arguing about it, there is no strong mechanism rejecting false beliefs.

To the contrary, new beliefs can seem more reasonable by being associated with previously accepted beliefs, so beliefs in clusters of strongly held beliefs such as religions and certain ideologies are less likely to be true than the first belief in the cluster to become generally accepted.