Thus, anonymity is no excuse for not heeding a
person's concerns -- in fact, in the real world, some of the best tips
received by law enforcement, tax administration, SEC violations, etc., are
anonymous. As KC noted earlier, it is the content that matters not the
source, and in this case the content is valid.
When someone anonymously reports a crime, they are reporting a
verifiable fact (if the appropriate authorities cannot verify it, they
won't do anything about it). The Concerned Wikipedian's email did not
contain facts, it contained opinions (any facts stated were already
known to anyone following the case). Therefore, it is not comparable
to an anonymous tip off.