In the days before ‘the feel-good-G.E.D. days’, McDonald’s was the place where high school drop-outs who couldn’t make it were hired.
McDonald’s is a fast food industry, where anyone with half a brain would excel, unless the boss hired illegal wetbacks, citing that American kids were too lazy, or too inattentive, or not having been taught that it is they who sink or swim, not the company.
None of which are reasons to not give them a raise. Again, it’s the company’s money, they can spend it as they choose.