The U.S. dropped the atomic bomb on Japan in WWII believing it was worth the loss of life to gain the end of the war and stop the higher loss of life if the war continued. If not willing for everyone to follow the rule, then it is not morally permissible. Emphasis on autonomy, justice and kind acts. People treated as ends, never means. It provides a special moral status for humans.
Moral rules are universal.
It says nothing about other living things. Rules can be abstract. In the U.S. a continued emphasis on human rights for all people stems from a willingness to reason that justice and equal treatment ought to be applied universally. It seeks to produce good people who act well out of spontaneous goodness. It emphasizes living well and achieving excellence.