It is in Burger King’s best interest to offer employment opportunities in such a way as to encourage appropriately skilled employees to forgo other alternatives and work for Burger King. This encouragement can be a combination of wages, benefits, work environment, flexibility, among other things that one might considers when choosing a place of employment.
What these employees seem to have forgotten is that they are all volunteers. There is no lock on the door. Each day they return to work, they make a decision to forgo other opportunities and work at Burger King. They may not like the work but what they dislike even more is the alternative of not working there, whatever that may entail. That may be unemployment, unsafe working conditions, a longer commute, or an uncertain future. Whatever they perceive as the alternative, they make the choice to stay.