It would be like real-life; anonymity is the third pillar necessary for The Greater Internet Fuckwad Theory:

http://www.penny-arcade.com/comic/2004/03/19/

HN is the first "community" I have ever given my real name to.

Absolutely- One of the things I enjoy about the HN community is that is is, most of the time, much more like spending time at a school lounge, than it is like an internet forum.

Being more like real-life isn't such a bad thing ;)

How would you enforce non-anonymity?