 These limitations, for Kovel, "keep ecofeminism from becoming a coherent social movement".Though Kovel recognises social ecology as part of a similar radical tradition as eco-socialism, he still distinguishes one from the other because Social Ecologists see hierarchy "in-itself" as the cause of ecological destruction, whereas eco-socialists focus on gender and class domination embodied in capitalism and recognise that forms of authority that are not "an expropriation of human power for ... self-aggrandizement", such as a student-teacher relationship that is "reciprocal and mutual", are beneficial.In practice, Kovel describes Social Ecology as continuing the anarchist tradition of non-violent direct action, which is "necessary" but "not sufficient" because "it leaves unspoken the question of building an ecological society beyond capital".