How can any service provide equal benefit to every citizen?
Does the function of maintaining justice provide equal benefit? A standing army to protect our borders? Police to maintain law and order? Courts to resolve disputes? Public education was originally justified - not because everyone had a 'right' to an education, but - because an educated population of voters was a public good that benefited everyone living under our democracy.
It's a judgment call, obviously, but when a government service can't but justified as something that promotes the
general welfare of the nation, and instead services the
specific welfare of individuals or groups, then it's not something we should be using government to provide. In particular, when we are tempted to look at a given program as something that only some people benefit from, at the expense of others, then we ought to question whether government is the right vehicle for providing that service.