In reality, one would have to be omniscient in order for the utilitarian principle to be a reliable guide. Moreover, it places an elite in charge of the decision-making. And generally such policies are not put to a majority vote and enacted by the popular will, but decreed by a ruling elite. There would seem to be principles such as truthfulness and fair play that are as basic to morality as the general happiness. Hence our pursuit of the general welfare is conditioned by other even more basic ideals.
Utilitarianism has nothing to say on the matter.
It seems clear that while the well-being of others is an intrinsic good and we have a duty to promote it, we must not promote it in such a way that other intrinsic goods are sacrificed. Yet the premise that pleasure is desirable is false . Sure, it is desired . No, for there are bad, as well as good desires.