I know that but the gouvernement could passes law and unions couldn’t do nothing about it (that’s what happen when a gouvernement uses force instead of dialogue). In the recent years the French gouvernement passed many laws that weakened employees rights. Do you know that if you go into court against your employer and you win, you will just get few hundred euros? It won’t ever cover for lawyer expenses. That’s because a law was to max the amount you can and it is very low.