I have seen this - the union I was represented by at the time declined an additional holiday offered by the company. At pretty much the same time, I was moving from a union position to a management position, and from both sides, my response was a big ol’
I have played just about all sides in this particular game – as an employee represented by a union (although not a member), as management not really in contact with the union, and specifically a manager involved in union neogotiations. One important role that unions have is to serve as an ombudsperson of sorts. As a manager, my #1 goal is to take actions that benefit the company. Even if I have personal sympathy for a particular situation, the company comes first in my decision making. The union process enables an employee(s) to address a given situation with the employee’s best interests in mind. When the system works, and I believe it only makes the news in those few occasions when it doesn’t work, the result is often a very reasonable compromise.
Now, we can take that a step farther, and see that for many companies, it is in their best interest to treat the employees not only fairly, but more than fairly. The benefits for the company are happier, more productive employees, low attrition, etc. I think in some ways this has created some of the current problematic union situations. To entice the employees to join/support unions, the union must demonstrate how much better things are with a union, and sometimes create mountains out of molehills in order to have an issue to rally around.