The Justice League may have "justice" in their name, but that doesn't mean they haven't gone overboard. Batman has his "one rule," and the rest of the members tend to agree to a no kill policy, but they've still aced a ton of dudes over the course of the years. From Superman finally zapping Lex Luthor, to Aquaman killing his brother in cold blood, to Hawkgirl mercy-killing Solomon Grundy, Cartoon Network's Justice League was filled with many dark moments of death and murder.