No... Any persona you take on is a reflection of yourself. If you pretend to hide behind anonymity (while telling folks what you do, where you work, and not really being anonymous at all) and then act like a griefer, a jackarse, a general SOB, then that must mean you have those qualities in you already. Society limits these things in a face-to-face environment, whether a person like this instigates violence with their actions and is punished (learning a lesson) or is sanctioned with loss of job, family, or jail time.
In here, there are no sanctions, other than a banning on the forums.
Which, again, it seems some folks are immune to, no matter what they do.