I'm firmly in the "more harm than good" camp. Mostly because I'm not fond of being stalked. Too much of a headache, and killing your stalker carries a harsher sentence than them coming into your home to molest your pillows. Anonymity has its uses and its side-effects.
You don't have to say or post anything to use the internet, and its most harmful uses tend to involve more accessing data than uploading your own. In that 24-48 hour period, I wouldn't post a damn thing, and I'd hope that my previous posts didn't retroactively display my name... in addition to the stalking problem, we also have identity theft. A real name linked to an account pseudonym is one of the major pieces of info needed to accomplish that particular crime.
Guard your data carefully, folks. What trolls do isn't serious, what can be done with access to your personal information is.