Just playing devils advocate here. What would be the problem with such a statement: ‘I think as the dominant race on earth, we have the right to own and kill other races as slaves for the productivity of our society, but not to inflict undue suffering on them’
I’m just pointing out that libertarian philosophy can get complicated when you consider how difficult it is to consider the consequences of your actions. Free to do whatever as long as you don’t hurt others, sounds totally agreeable. But most wouldn’t consider non-human animals as part of ‘others’ or second order effects that can be harmful to ‘others’.