There's some very nasty security issues
The possible problems are not just the standard one tiny configuration mistake and all your data can be read globally (and there's some horrendously sensitive data that might leak - such as thugs finding out who shopped them).
But suppose someone gets write access? Delete their own records and the evidence - or add records and 'evidence' to someone else's file. And all sorts of other nasties depending on just what gets stored.
Biting the hand that feeds IT
