What differentiated a human from a beast? That was a question many had asked. Klautz had his own beliefs regarding this.
What differentiated a human from a beast was their tendency to leave behind a legacy. Their offspring often carry their will. It burns through them as it is passed onto from generation to generation.
A monkey thus has no clue about their ancestors while the same wasn't true about humans. Many humans, even though dead, had left their marks on history.
A monkey might seem pitiful in comparison to humans.... He might not be able to leave behind his will but at least, he was able to leave behind his bones.
But the humans who couldn't even do that had a fate worse than these wild creatures. That was what Klautz believed and that was the fate of every ninja.
Ninjas had the pitiful fate of destroying their own bodies before bleeding to death. There was no disgrace to a human higher than the inability to not even leave behind his bones.
