Dr. Cakey said:
An interesting take on things, Cake Doctor, but you imposed a generality on me. I don't believe that ninjas are often assassins in black. There may have been some, but those are what drive the kinds of tropes that inevitably lead to Dr. McNinja, so you know it can't be the norm.
Many of the historical ninja were peasants, oftentimes such people who can't afford a sword and thus improvise with what they've got. The notion of the silent killer comes from the idea that...in war time if nowhere else...peasants did not care HOW they dispatched a samurai, who is built for a stand-up fight. Peasants are not warriors. They just want the enemy dead. What lead to the black-clad figures was likely misinformation and tall tales to give others a degree of concern and to look for the wrong thing.
The idea that the farmer, the butcher, the common worker...would do things in a shouty manner is preposterous, because he (or she) would DIE. A little truth-in-tale from Rurouni Kenshin is that most commoners weren't even
allowed to own a sword even if they could buy one. It was a higher-class thing. No sword means no easy way to deflect those keen-cutting blades, so a stand-up fight is out of the question most of the time. Killing silently isn't just better. It's required as a survival trait!
Naruto doesn't follow this. If anything, it's suppose to take after Japanese legends and the romantic notion of the ninja itself, not the historical ones. The thing about that, though, is that it doesn't fit the romanticism either. I can't really think of any sort of ninja - fictional or non-fictional - that acts like any of these people. Bruce Lee is quieter, and he outright beats the crap out of everyone! (Though, he had several cases of sneaking around and using disguises effectively in movies.)
I didn't make the comment idly. I meant it. And if someone from Japan who knows history better than I do (probably alot) would like to step forward, I'll gladly discuss it, but in the meantime I have to stick with my guns on this one.