The Source of Cyberharrassment

We tend to associate the idea of trolling as originating from the ability to write anonymously online. However, is that truly the case? While it does indeed allow for such things to happen, it may not be the source of offensive comments on the internet. I believe that anonymity is simply a platform for trolls to do what they do. The source, on the other hand, lay elsewhere. Perhaps the issue lies not in anonymous writing, but in our very own culture-- that perhaps the aggressive behavior that is present online originates from real life stress. If that's the case, then we should focus on improving people's behavior in real life before trying to pin the issue on the ability to write anonymously. What do you guys think?