Of course, no one believes in being "unfair" to labor. The disputes come when people disagree over what constitutes fairness.
On the one hand, some people feel that higher wages and guaranteed jobs are fair to labor. This is typically a position taken by labor unions. They feel that the companies could not prosper without the workers. Therefore, they say, workers should get higher wages and should not have to fear being laid off.
On the other hand, members of management would typically say that trying to preserve as many jobs as possible is fair to labor. If some jobs need to be cut so the firm can survive, that is fair to labor. If wages need to be lowered so that the firm can survive, that is fair to labor. In this view, doing whatever is necessary to allow the firm to prosper is fair to labor because that would result in a larger number of jobs than would exist if the workers are given higher pay and "guaranteed" jobs.