Also, note that, for however much psychological studies are worth, I think one of the more common theories in psychology right now explaining concern/lack thereof about animals is that human supremacy is an expression of social dominance theory towards animals, that is, it is just an application of general desires for hierarchy (social dominance orientation), not something really specifically targeted towards animals. Creating norms and attitudes against domination of animals will reduce this general desire to dominate, reducing one of the psychological bases for prejudice in general. Depending on how much influence you think institutions vs inherent psychological traits have on human behavior and the potential of both to be changed, this could either be pretty low flowthrough impact or very high impact.
Also, note that, for however much psychological studies are worth, I think one of the more common theories in psychology right now explaining concern/lack thereof about animals is that human supremacy is an expression of social dominance theory towards animals, that is, it is just an application of general desires for hierarchy (social dominance orientation), not something really specifically targeted towards animals. Creating norms and attitudes against domination of animals will reduce this general desire to dominate, reducing one of the psychological bases for prejudice in general. Depending on how much influence you think institutions vs inherent psychological traits have on human behavior and the potential of both to be changed, this could either be pretty low flowthrough impact or very high impact.