It's illegal. Are you suggesting that France should resort to illegal actions to counter crime?The best thing to do would be to actually go ahead and close down the known hard line mosques, and revoke nationality and deport anyone who is strongly against that. And if that includes a shed load of liberal do gooders...happy days.
So do you think that France can change UN law?
https://en.wikipedia.org/wiki/StatelessnessIn 1948, the Universal Declaration on Human Rights] (UDHR) was adopted. It provided both a right to asylum (Article 14) and a right to nationality (Article 15). The declaration also expressly prohibited arbitrary deprivation of nationality, which had affected many of the wartime refugees.
Sure, but there's a world of difference (s'cuse the pun) between having a man with a red flag walking in front of a vehicle, and stripping someone of their nationality.
It simply couldn't happen. They would be forced to hold anyone, that they wished to 'de-nationalise' or deport, indefinitely while the due legal processes were completed. Then the UDHR would be paramount, and France would lose the legal battles.