First off, it's the fucking law that they have to pay severance. So, by law, they sure as hell do owe employees something ... your idiotic belief that workers should be grateful to a have a job and suck it up if they get fired is irrational libertarian drivel.
From what the article says, the CEO wasn't trying to get out of paying anything to the workers. The company was asking to be allowed to pay installments so they could avoid bankruptcy. The government either wasn't legally able to bend on this, or hoped investors would invest more money after they exhausted all other options. The investors decided not to put more money in, and the company filed for bankruptcy. So basically everyone loses, which sometimes happens in a game of chicken.
This is what happens when your labor laws are too heavily weighted towards the worker. It generally hurts overall GDP because companies suffer, but that is counterbalanced by the population's desire to give up a little GDP to have a better quality of life. I would like for my country (the U.S.) to give up a little GDP for better worker rights too (not as good as France though), but it is naive to think we can have these better worker rights without companies failing because companies cannot be as "agile".