Anonymity breeds trolls due to the lack of consequence. Because of trolls...anonymity is best. (Yin/Yang)
You never know when one of these dedicated looneys might show up on your doorstep.
I only recently revealed my true City and State in order to try and stimulate some cultural conversation. Other than that I did not even use my common forum name because it is so unique that it could easily be tracked back to my real identity.
And if there is one thing that American's have been trained religiously to protect....it is your identity. Am I right fellas?