I suggest that the solution lies with all of us. If you see someone harassing someone else, please ask the harasser to stop it, and if appropriate, to seek advice.
Harassment is, except for prevention, a peculiar problem to deal with.
First of all people disagree strongly about what harassment is, especially if a case goes formal. For these reasons, the community at large does not readily comprehend the extent to which MIT people feel their lives unreasonably disrupted by mean behavior. In 1973 MIT was probably the first major employer and the first academic institution in the US to use the term harassment and to develop policies and procedures about offensive, intimidating and hostile behavior that has the intent or effect of unreasonable disruption of the educational or work environment. Not only have we worked on these questions and developed some of the more widely recommended options for dealing with harassment concerns, but we have had, since 1973, two presidents and three provosts who feel strongly about the subject. In fact most people at MIT feel really strongly that harassment is unacceptable.