I'm not trying to convince anyone of anything. You asked for data, I obliged... with a report of 900 accidents worth of it, along with shortcomings (age). I'm sure you could find a similar study to prove the exact opposite if you looked hard enough for it.
"But of the 7,163 accidents that killed or injured California motorcyclists last year, 2,822 included factors often seen in lane splitting -- excessive speed, unsafe lane changes, improper passing and following too closely, according to the CHP."
I know that I can't reason with someone who equates the above statment to "40% of accidents were caused by splitting." Futility doesn't sit well with me.
Ah, the ancient art of the partial quote lol.
So up to 40% of the accidents were caused by splitting.