Any supplier would be understandably miffed if they were constantly being portrayed in an unfair manner with no right of reply. Especially so if they were a major advertiser with the parent magazine.
To that end the FE has to ensure as far as possible that posters comments are fair and accurate.
Events are often challenged both by the FE and others, not because the poster isn't beleived, but to ensure all relevant facts are laid on the table.
There is an inevitable bias towards poor service, because people expect good service and don't feel the need to comment on it to the same extent.