People join philosophical movements for the same reason for which they might join groups like Weight Watchers and Alcoholics Anonymous. They are in need of group therapy. They have lost confidence in their own mind, they find themselves helpless against whatever vice they think they are plagued with. The vice can be irrational or immoral philosophy, alcohol, overweight, bad health, or something else. They want to belong to a group where they can find people who will influence them into transforming their thinking and psychology. Joining a philosophical movement is the sign of intellectual infirmity and collectivist psychology—it is not a sign of intellect and independent mind.