That is a common misconception.
Answer this.... Have you ever heard a police motorcycle creeping up on you?
Probably not, i'm guessing. You usually don't notice until the lights and siren go off. Given your statistics. Motocops would be in accidents everyday. Yet, amazingly enough they get into less accidents, not to mention that they are on the road significantly more often than the average motorcyclist.
Situational Awareness is key...
From the report:
14. Conspicuity of the motorcycle is a critical factor in the multiple vehicle accidents, and
accident involvement is significantly reduced by the use of motorcycle headlamps (on in
daylight) and the wearing of high visibility yellow, orange or bright red jackets.
A logical extension would be to say that anything that makes a moto more conspicuous can help reduce the incidence of accident involvement with other vehicles.
ie: loud pipes.
also I bet this has shifted quite a bit to the older end of the scale.
20. Motorcycle riders between the ages of 16 and 24 are significantly overrepresented in
accidents; motorcycle riders between the ages of 30 and 50 are significantly underrepresented.
Although the majority of the accident- involved motorcycle riders are male (96%), the female
motorcycles riders are significantly overrepresented in the accident data.