Given that scams aren't moderated, are mods often moderating inaccurate information? I've certainly seen tons of post with either inaccurate or outright false information in a variety of boards that don't get deleted. I've always felt that it's better to make a post correcting the mistake so other people can learn from the thread too.
I with this, as it keeps everything out in the open. Inappropriate post deletion can kill a discussion, and lead to the loss of members. It is much better to correct an incorrect opinion, and then the poster can learn from it.