check out the linked report. Looks like 50% of riders are "bad apples"
Quote:
Many public land managers assume that designating additional off-road vehicle routes will lead directly to greater compliance, less cross-country travel and, as a result, less resource damage and fewer conflicts among incompatible uses. Some believe that off-road vehicle riders will quit creating renegade routes once more routes are designated “open” and riders are educated as to where they are and are not allowed to ride.
In contrast, the research above shatters the myth that damage and conflicts are being caused by an insignificant percentage of off-road vehicle riders. The findings of these studies suggest that even if the “demand” for more off-road vehicle riding opportunities is met, riders will continue to fulfill their preferences by riding off legal routes. They also conclude or at least strongly suggest that education and information alone are not effective strategies for changing off-road behavior.
Instead, Monaghan and Associates offers the following recommendation: “In order to be successful and actually influence behavior, OHV users must be motivated to behave properly.”
http://www.wildlandscpr.org/biblio-notes/just-few-bad-apples-research