because it must. It's not only the "all in it together" aspect, but the individual making the complaints may very well have good ideas for fixing the problem. Plus, if job performance meets standards, there is no real way to legally quiet the individual; unless they are insubordinate, you can't kick 'em out for having an attitude or complaining.

In the civilian world, the presumption seems to be that you are trying to make trouble, so the squeaky wheel gets replaced.