By "just as much right", I mean to say that we as humans scarcely have a "right" to this land either. So what gives us the "right" to assert our dominance over

By "just as much right", I mean to say that we as humans scarcely have a "right" to this land either. So what gives us the "right" to assert our dominance over other creatures to the point of extreme detriment? When does it stop being simple predatory domination and become something sinister and wicked?