Remember that little old lady who sued McDonald's for getting burned by their coffee? McDonald's spun the story to make the case seem a frivolous suit. But the real story is quite different.
When a business requires its employees to do things that endanger the employees or the customers, it is in violation of the law and of its moral responsibility to the community. Maintaining coffee at a temperature of 190°F is a danger to those who handle it and tthose who buy it--and it destroys the flavor of the coffee.
I would remind you that McDonald's has been the leader of keeping the minimum wage below a living wage standard. Read Fast Food Nation.