Yep, that´s very often true.
However, when it comes to crashing motorcycles, there is no absolute right or wrong, i believe, and it seems to me sometimes some people at Superbike school believe they "own the truth"...
"People crash motorcycles" seems to assume the bike is in "perfect" working order and the surface is in "perfect" condition.
I´ve crashed due to many things, from the gearbox disengaging into false neutral while i entered a medium/fast corner (track...quite a bit of air time on that one...), to hitting a dog in the rain at night, to clipping the back wheel of another racer´s bike with my front wheel, while braking hard and trying to avoid another guy who wanted to outbrake both of us and went straight (big crash, that one...must have looked great for people watching ), etc, etc...some were my fault, no doubt, while others, there´s not much i could have done, i reckon.
Anyway, we´re allways learning, and any crash that you get up from is a "good" learning experience (though hopefully not a frequent one ).
PS : Nakano didn´t crash the ZX-RR at 300 kph in Italy when his rear Bridgestone exploded, did he?... (not that i´m comparing myself to the pros, i suck big time as a racer! )