My thoughts:

For good reasons, police and other organisations usually ignore anonymous tip-offs, complaints etc.

We have seen a number of valid reasons for wishing to remain anonymous. Fear of intimidation, persecution, illicit use of the web etc. There HAVE, however, been useful and informative postings from anonymous guests.

It is now not possible for a member to impersonate another member for whatever reason.

The only problem seems to be the confusion caused when a GUEST posts derogatory or inflammatory remarks - hardly what one expects of a real guest, of course.

If other guests are upset at being falsely identified with the flamer, then the remedy is in their own hands.

I suggest therefore that the only sensible course of action is as suggested by George Seto above - do not reply to them. But if they have posted useful information, use it.

Also, the concept of freedom of speech is intended to allow different opinions to be aired. The old saying goes 'I don't like what you say, but I will defend to death your right to say it'. I know this has been restricted by all kinds of laws, but the concept is surely one which we need to strive for. The alternative is censorship, and we all know where THAT leads.