I'm not Mr. Gung-Ho Alleycat guy, but if these riders wanted safe and controlled races, they'd go to the velodrome or the local criterium circuit. Clearly the appeal of these races is the danger. Most riders have seen the Monster Track videos and they're eager to emulate what they've seen there, and I don't know how race organizers can possibly expect to stop that.
Riders just need to be smarter and to know their limits.