>>The likelihood of an employer firing people abusively is much greater than an employee being an asshole.<<

Not my experience in the jurisdictions where I've worked, but certainly a widespread belief among many French people.

>>Relaxing a law to fit the legitimate needs of a small number of start-ups..<<

I think the French labour laws need to be relaxed for the good of the French economy, not just for start-ups. The current system benefits those already in employment by entrenching their positions, but to the detriment of younger people seeking work.