First off, the OP represents self-entitled douchebag trail users, a group that encompasses all modes of travel, whether on foot, on horse or on a bike or motorcycle.
Second, based upon my observation, there are many electric motorized bike enthusiasts that have adopted the "There's not enough law enforcement staff to enforce any ban of electric motorized bikes so I'll put forth no effort and will win by default" school of advocacy.
This type of advocacy is popular with all types of trail users, especially mountain bikers. Instead of investing time and effort to build trust and earn respect, they choose to ignore whatever regulations that don't agree with them. They do not care how their actions affect others so efforts to try and educate them of the "big picture", in my opinion, is a waste of time. I know many of you may disagree with this statement, and for those of you with the patience to try, I applaud you.
If your definition of success for this type of advocacy is your ability to ride your motorized electric bike on trails, regardless of legal access, I concede your advocacy model will be successful in some areas.
There was a time when lawlessness was the norm, penalty of laws was not a deterrent due to lack of enforcement. This era was romanticized by Hollywood and became known as the time of the "Wild West". The advocacy model mentioned above is a "Wild West" model. One reason this advocacy model will not be successful all the time and everywhere is because there are smart "Sheriffs" that understand how to maximize the "reach of the law" through deputizing and the concept of the posse.
Some people may not GAF about authority, of regulations or how their actions may affect others. Some people understand the efforts, the time, the commitments, the relationships and the privilege involved with trail access. If one doesn't agree with a regulation, and chooses to threaten everyone's access, well, the irony you may be in a position wishing for the Sheriff to come to your rescue cannot be overlooked.
This is an attitude issue. Not a mode of transportation issue. Granted, this specific dialog was instigated by a specific type of user but we all have seen this attitude before, from all types. Which is why I personally hope that electric motorized bikers get more organized and put out more efforts to advocate for changes to policy that negatively affect them.