The commonly cited origin is the need for a weapon that wasn't a weapon. The Jitte was never intended for use in "war."
"We" do? Which "traditional martial arts?" Heck which "martial arts?"
And some folks in this thread are helping you update your learning.
That's rather arbitrary. Why not 2,000 years or more? Why not 500 or more? It seems like you have a whole lot of preconcieved notions about what "martial arts" are and are unfortunately caught up in the very natural human trap of confirmation bias.
There weren't any wars anywhere else?
Your whole "example" is predicated that "martial arts"
MUST have a military origin. They just don't.
Maybe the Bandits have better "martial arts."
They did? I don't think that the historic texts actually support this. Most of the ancient civilizations seem to have had a legal system which supported judicial methods of conflict resolution. Babylonian, Hebrew, and Hammurabic codes are quite clear. No doubt that duels happened, but you certainly can't say that the only, or preferred, method was dueling. Heck, according the Hebrew texts, Moses had to flee from his home as the result of settling a problem he had with another man in a fight, which resulted in the others death. Again, it seems that you are looking for what you want to see instead of what is actually there.
Define "duel," the context, and then offer support of how often a duel was engaged in and how often it resulted in death. I know that this is very interesting to historians. I recall sitting for one Doctoral who read excerpts of his dissertation on dueling. There was so much variation over the centuries that he had to restrict it to a specific area for a small slice of time. I helped republish the book "The History of Deulling."
https://www.amazon.com/History-Duelling-Countries-Jared-Kirby/dp/0557343526 See that name "Kirk Lawson" there under "transcribed?" That's me.
What is a "street fight," what historic and geographical context, and please reference what you used for your source for number of "street fights" vs. number of fatalities from "street fights." Carolyn Conley's "The Agreeable Recreation of Fighting" sifted a lot of source, including court records which showed that deaths were less common than what some people might have thought but that when deaths occurred it was often not considered as big a deal as some today would assume.
<cough> <cough> I've trained with some folks from a few of these and have friends in more. I was once asked to give a brief presentation of European Military Saber to some of his Silat students.
Ummm.... what? The internet is positively awash in free texts on martial arts and martial arts histories. If you haven't found them, you're just not looking.
Friend, I have read "about" many of these folks. I've actually read what they wrote in some instances. They didn't typically have 12-hour training days. It happened some, but it wasn't a life-long effort. The body just can't handle it, particularly as it ages. That or what you're defining as "training" is a bit different from what most of us think.
You know, don't you, that Cracked is a humor site known for it's listicals, not an actual scholarly site? You read Cracked to laugh (back when they were funny) not to get advice on Martial Arts.
Would I be wrong in guessing that you haven't been pursuing Martial Arts for very long? You seem to be promoting positions that I've come to associate with people who are still fairly new to martial arts training. I'm not trying to insult you or promote myself, it's just an observation.
Peace favor your sword,
Kirk