Tbf Oda Nobunaga was absolutely psychopathic. One of the reasons given for Akechi Mitsuhide's betrayal is that Nobunaga broke a treaty with the Mori, knowing doing so would result in the Mori executing several hostages, including Mitsuhide's mother. Nobunaga didn't care though. Plus there was the time he set alight an enormous fire on the mountainside of Mt. Hiei, and gave the order to slaughter any man, woman, or child his soldiers came across.