Pudlo’s thoery on database integrity:
“The bigger the database, the more prone to error it becomes, AND the more difficult it is to fix it.”
insert your most personal and critical data here, and see what’ll happen
Another concern is the bureaucrats using it to smear or destroy political opponents. Remember what they did to Joe the Plumber. Imagine if they had Sarah Palin's medical records which reported a mysterious rash in a sensitive place (as one hypothetical example).