safeguards is the real problem
Being French, I follow that quite closely.
Actually, the uproar is not so much about the file existence per se, but about safeguards. One similar tightly regulated file (STIC) exist already, but it gather a lot less information (and only on people actually involved with a police inquiry) and its consultation/use is recorded and reserved to law officers. There was already problems with that one (you can be added to it just by being the victim or a witness, rate of errors is high), but there is clear procedures about who, when, how.
Here, such safeguards dont exist at all, in fact the file existence was known only when the CNIL delivered a negative advice. CNIL teeths having been pulled out, its advices are not anymore mandatory to follow and the government tried to push the decree while everybody was on hollydays.
Also the link to other files is explicity seeked.