Further: Is the ansatz that harrassing behaviour is a sign of poor mental
health on the part of the harrasser commonly accepted? A quick google turns
up more hits about research showing mental health effects of harrassment on
the harrassed person(s).
If within 'mental health' you include the concept of thriving, then it
might be useful to look at resources like "Net Smart: How to Thrive Online"
by Howard Rheingold.