The problem with that line of thinking is that nearly all of the research contained in the JSTOR database is publicly funded. It comes from taxpayers in the majority, the minor portion comes from the university.If I spend a million dollars conducting a study the results should be mine to do what I please with. Would the right/ethical thing to do be to openly distribute this? Of course. Should anyone be forced to disclose this kind of thing? Nah, I don't think so.
In other words, we, the public spent millions to conduct the research and are not being allowed to see it.