An analogy: A king of flesh and blood enters a province, sets up statues of himself, makes images of himself, and mints coins in his likeness. After some time, they upset his statues, break his images, devalue his coins — and "diminish" the likeness of the king. Likewise, Scripture equates spilling blood to "diminishing" the likeness of the King, as it is written (Genesis 9:6) "One who spills the blood of man … (For in the image of G–d did He make man.")