Well, that's where the whole business of Internet anonymity comes into play. What if people had to post their state-supplied identifying information at all times, so there was no doubt about who they were? This is more or less how traditional journalism works: the reporter doesn't generally get to hide behind a screen of anonymity. Editorial board op-eds are often unsigned, however.

I think anonymity is OK personally, it falls into the tradition of anti-government pamphleteering in pre-Revolution colonial North America under British Royal rule, and samizdat literature in the USSR.