That is the problem. There is no way that the forum could verify every scam accusation, nor should it have to now that there are more appropriate services available for this. Since we can't make exceptions to allow for people to post the personal information of scammers, we have two choices:

1) Remove all posted personal information, like Reddit.
2) Allow everyone to post personal information about anybody.

Bitcoin attracts a lot of scammers, so I would tend to err on safer side of allowing all personal information. Not to mention, if it wasn't posted here, it would just be posted somewhere else. Public information cannot be made unpublic.