BS”D
1) We are not “our greatest Rabbonim”.
2) As an Internet professional and someone who has also had the zechus to use the Net help people who have cried out, I think that in most cases I can tell the difference between someone who is just starved for attention (a/k/a a troll) and someone who is crying out because of real disillusionment. Even if the people posting some of what they post here do believe in their position, posting here is just a way of getting attention because they know they are in the minority and therefore will spark debate.
3) No matter what the case may be, none of the “krum” posters here is articulate enough to convince anyone of his position. So, the only possible danger is that the krum posts may show up on a search engine. But in the case of those who just look for attention, replying will just generate more and more krum verbiage in reply. If someone is looking for help, especially if he or she was mistreated or perceives to have been mistreated by our community, we need to reply very simply – we understand what happened but it is not representative of our world, and what can we do to help.