It's all excuses. Someone might get an owie. They might not catch them. They don't have the right vehicles. They don't have the authority. It's all excuses.
The real problem is a lack of funding for sufficient law enforcement. The reasons for lack of funding are twofold:
1. The OHMVR is responsible for a large part of the law enforcement funding for areas popular with OHV users, and that funding has been diverted for the last several years very effectively by the past Chairman and his friends on the Committee toward pet environmental projects and personal airplane tours:
2. Law enforcement has this pesky little problem with a thing called "bigger problems" than annoyances of people who already complain too much and demand absolute control over anything within the range of their gas tank.
Sometimes, more noise and constant harrassment of law enforcement doesn't get more attention, it gets less. Law enforcement doesn't have enough resources, and can't justify devoting existing resources that are currently demanded by much larger and more potentially dangerous problems.
Most LEO's I've talked to who are responsible for enforcement of land use regulations are chomping at the bit to have the tools necessary to chase down deliberate lawbreakers. They want the training, the equipment, and the time to devote to it. It's all a function of the two above reasons, both of which can be solved with money and resources.
You're wrong again.