The problem with utilitarianism is the focus on doing the most good for a select few, such as Adolf Hitler and his idea of launching a national genocide against Jews on the ethical grounds of restoring the Aryan race.
This case of the Adolf Hitler and the mass genocide against the jews on the ethical grounds of restoring the Aryan race is considered to be the problem of the utilitarianism as its work not to punish a person as it violates the right stands the duties as for the utilitarianism that matters is the net happiness and no injustice.
