That corner isn't really that difficult to negotiate...
People are just dumbasses...
Lots of factors figure into the crashes that have occurred there, IMHO...
1) People know there's lots of people watching and, of course, the cameras, so maybe they're showing off a little, get in over their heads and biff it..
2) All the previous corners leading put to the long sweeper are relatively short, sharp switchbacks. I think maybe as people throttle out of the previous right hander, they get caught off guard by the different type of apex, their brains can't compute, so they freeze up and just mosh on the brakes, lock 'em up, and crash...
3) This part of LA is
extremely wealthy. A lot of riders there have more money and horsepower than they have brains.
Most riders up there on any given weekend don't have the first clue on how to ride a motorcycle safely, let alone what to do in an "Oh Shit!" situation...
I'll admit, I got caught out on that corner once... I'd been through that corner dozens of times before, but once, coming out of the right hander before, I clicked up into third instead of staying in second. Well, dumbass mistake.. But instead if freaking out, I looked through the turn, stayed off the brakes, and let the bike do it's thing...
I learned a lot from that little episode... Like that my bike was much better than I was, I had gobs more lean angle than I ever thought possible, and what they teach at rider safety courses really does work and can save your ass...
As an aside, before moving back to Connecticut, I stayed away from that part of Mulholland for almost two years because of the amount of terrible riders... I opted for the 150 from Santa Paula to Ojai and then the 33 from Ojai up through the National Forrest.