Tametomo could kill Yoshitomo and Ietada if he wantｓ to do so, but he doesn't on purpose because of consideration for his older brother and sympathy toward the brave warriors.
為朝は義朝や家忠を殺そうと思えば殺すことができたが、兄への遠慮や勇者への共感があってあえて討つことをしなかった。