There is a flavor of political activism for every belief, background, or personal preference. We have them for gays, Christians, atheists, gun lovers, Jews, gun haters, women, Muslims, homeschoolers, public school teachers, children, families, poor people, businesspeople, environmentalists, etc.
Almost all of these movements arose out of a condition of encroachment, oppression, or violence. This means that most of these groups began with an excellent cause and were justified in their advocacy. The problem is that most of these niche movements will continue to exist and operate long after they have achieved justice and fairness. The reason is that these advocacy groups were never founded on any kind of a rational principle, rather they were founded on the basis of self-interest—a group of people were not happy with the way things were working out for them. But self-interest is no ethical principle at all. Unrestrained self-interest is the lack of ethical principle. At first this seems obvious, but it gets fuzzy when self-interest and ethical principle happen to overlap.