France is a police state in which citizens are all suspects. Cryptography was illegal until 1996 outside of government/military use and it's one of the worst countries for any hobbyist who needs to use radio frequencies, fly stuff around or even mere street photography. This law will make it easier for the government to crackdown on anyone using encrypted messaging as a pretext to arrest them or put them under surveillance.

Note that the current interior minister and his predecessor both are vile fascist scum.