Because of the weight you put on the stories. There is no advantage to being truthful.
As usual, you've decided to lock onto a single aspect of a statement and claim it is the entire statement. I made it clear that anecdotal evidence is a part of the validation (along with sparring, randori, purposeful resistance, and examining what is working in arts/styles that compete), because to exclude it would be to exclude the only evidence we have that comes from the real world. You choose to see that as too much weight put on it. Then go ahead, ignore what actually happens on the street, if that works for you.
I'm now done with this discussion, too. You have the knowledge and ability to discuss reasonably. You simply choose not to, and to drive debates into useless loops. So now I'm done with you. I cannot help you with your mindset, and you clearly have no interest in helping me.