Most people want a job so badly that they'll take what they can get these days, and so terrified of loosing that job that they won't rock the boat in any way if they can avoid it.
The real question is how we are defining freedom. Here the minimum vacation is determined in labor law, but people -- individual workers -- are free to work how ever they like. Their employer can't demand it, but they can choose to not take their holidays. I pretty much see that as freedom in both directions.
I also think it's ok for a group of people to choose to utilize their government over unions for this effort. They are free to, right?