The most obvious reason for anonymity is that some (most ?) of us along the line admit to (or brag about) doing things that are not strictly legal. And sometimes make some pointed remarks about the constabulary. I don't have any concerns about the police members misusing such information. But the site is googleable (put you site nick into Google and see). So if people used their real names there would be at least some concern that some weasel at police HQ might tumble to it.
Also some folks have very nice bikes. Bikes that other dishonest people might like. Handy if you're such a dishonest person to know where to go looking.
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