Pretty much every story of Heracles has the same ending: "And then Heracles slaughtered [insert nasty monster or villain]." There's no getting around the fact that he was an incredibly violent guy. The dude just seriously loved to kill stuff. Sometimes he even got out of control and killed innocents. Of course, most of the time the people and beasties he killed were a threat to all humankind and Heracles is remembered and worshipped as a hero.