Exactly what Michael said.
I would also like to add, that there is a trail permitting process that details what work will be done on a trail and this is all pre-approved by the land owners. If a non-permitted person goes ahead and makes changes that are not on the permit, they can seriously jeopardize the trail access we are lucky to have. Land owners are hyper concerned about litigation and us having fun on our bikes is way down the list of priorities for them. Our access to trails is tenuous at best and it would not take much for it to all go away.
There is a bigger picture at play here that all of our collective small actions feed into.
Also, there are not enough builders to keep all the trails on the Shore maintained. If folks want to put shovel to trail we have lots of opportunities for them to do that. Whether it is showing up for a trail day or taking on maintenance of a trail yourself , if you have the passion and desire we can make it happen. There is a right way to do things, so if people feel that passionate about this, get involved with the NSMBA trail builders.