As others have noted, a large percentage of bike accidents today are “single-vehicle”, either young idiots riding like they’re immortal, or mid-life-crisis riders who don’t have the experience to know they’re going beyond their skills. Once you filter those out, and all the SMIDSY left-turn idiots, the accident rate is quite low.
I gotta disagree with one of the bikes in the list, though. The 250 they put in is touted as being safer because of the low-power engine, but the MSF actively teaches riders that the power and quick acceleration of a bike is a safety feature. Particularly with sport bikes, the acceleration is so quick that they can accelerate out of an imminent accident, and I have used that capability (fortunately only a couple of times).
most of those accidents are those who have ridden for less than six months AND have no motorcycle endorsement/training.