You combine a power structure (control over others in some respect) with pseudonymity and you'll accelerate this problem. Even without a power structure, people will try to dominate, bully others, by posting more frequently than anyone else in an effort to drown out other opinions or contributions. The anonymity disinhibits this behavior further (called the "greater internet fuckwad theory"): https://en.wikipedia.org/wiki/Online_disinhibition_effect