If you read carefully, it is in the Gospel.
I don't need to change history. Ninjas remain righteous. Break-off sects of Ninjaism do not in any way tarnish the Ninja's honorable history. There is no reason to be intolerant towards a part of the community for something that they have nothing to do with, something they did not begin or participate in.
Throughout history, the Ninjas and the Hari Krishnas have warred. The Great Asian Wars (which the history books tend to leave out) were a series of devastating wars instigated by the Hari Krishnas in their disgusting grabs for power. They were defeated soundly.
Since then the Ninjas have been aiding Pirates in the war against these Hari Krishna jerks, fighting side by side. The hybrid Ninja-Pirates have arisen from this.
"In the first place, God made idiots. That was for practice. Then he made school boards."
He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.
"If it turns out that there is a God, I don't think that he's evil. But the worst that you can say about him is that basically he's an underachiever."