를 is an object marker that identifies the noun as the target directly affected by an action.
하지만 특정 사람을 미워할수록 인류 전체를 더욱 사랑하게 되는 것은 언제나 그래왔습니다.1 But the more I hate any particular person, the more I come to love humanity as a whole, and it has always been so.