Have you ever been part of the Landmark Forum or been affected by it? Maybe a family member or friend has taken part in their introductory forum. I know how you feel.
Landmark exists to induct people through a form of brainwashing that means that Landmark can do no wrong. But everyone outside, those who don't participate in Landmark become strangers to the insiders.
Landmark derives from Werner Erhard's "est", which was an attempt to break people down over a period of three days in a closed environment with little sleep and food, so they no longer believed anything except what they were told.
Landmark continues to do this today. The purpose of Landmark is to get its members to bring in a constant stream of new members. This activity is often given out as "homework" to course takers. This is the way Landmark continues to make its money. It's looking for suckers and it finds them.