Mistake
"You know we could theoretically blame the entire war on the Second Hokage." One historian said as she leafed through an ancient text.
"I'm sorry, what?" Her colleague spat out his mouthful of tea.
"Well he is kind of at the root of everything." She continued. "You know, isolating the Uchiha, creating the Edo Tensei, killing Izuna. Really messed up on all accounts. Opened Madara up for manipulation."
"So his reign was a complete mistake?"
"No, just those points I mentioned." She sighed. "He was a genius beyond compare, he invented so much no-one else was capable of. What he lacked was judgement as to weather these things were actually a good idea. A shame really."