Because the press and people in France are know to be very sympathetic to tear-jerk stories from major Telecom companies?
The disregard for human beings isn't ok, but the alternative here is the company going bankrupt, firing all 130k employees, and prompting the sale of French Telecom infrastructure to foreign corporations at a discount via liquidation. I'm for that compared to harassment to suicide, but let's not pretend there's a happy alternative where everybody gets together and saves the company.
Get laws changed to allow for the firing and since it would be done publicly you can make sure the populace would pressure the government to give aid to those fired.
According to other posts it is apparently not as hard to fire state employees as is made out in the article but it costs extra money, so company paids the one-time redundency costs, shit happens, company eats the cost (and maybe the gov loans / bails them out to cover this one time cost)
There is an entire range of possible options, presenting it as a black and white "Necessary evil to prevent $ABSOLUTE_WORST_CASE_SCENARIO" is justifying the worst behaviour.
Not harass and screw with the employees to the point of suicide.
Sometimes a work-around to the problem is not better than an actual solution, no matter how painful the solution may be.
The "Via the window or the door" comment just shows how much they didn't give a damn about their employees as actual human beings.