What I feel is MOST significant is what OfficerImpersonator posted. That the MSF BRC is just that - a course that teaches you how to operate a motorcycle. Granted, some percentage of folks who take the course already have SOME operator knowledge/skill. Note the use of the word "operator" because operation and riding are two different things. Knowing how to launch without hiccups and stalling, how to brake without skidding or going over the handlebars, knowing how to turn, etc are all OPERATING skills. They are taught on small bikes in parking lots with cones. But that is a FAR FAR cry from the skills necessary to become a competent RIDER.
Significant I think to point out here is that most if not all State-mandated driver education courses require student drivers to complete some amount of actual seat time, on the open road with an instructor. In this case now, not only is the student learning how to OPERATE a vehicle but s/he is learning how to DRIVE a car. NONE of this happens with BRCs or even ERCs. And it gets even worse when a State (like Maine for instance) allows a new rider to simply take an 8-hour permit course involving ONLY classroom instruction and then sends them on their way with permit in hand to start riding. Go! Have fun!
Given that, perhaps it is no surprise what the statistics show? The BRC giving new riders a false sense of security? I don't know, that's an awful lot of false senses but.... The fact still remains that the US is WOEFULLY inadequate in its requirements for MC education and rider instruction.
I would be interested to know what the helmet laws are in the 4 states requiring training referenced in the article? Maine requires riders under 18 to wear helmets (don't get me started....)