My apologies to you a2psyklnut for not reading that a bit more carefully.
However I do own multiple horses, 5 to be exact, and I am not wealthy. Also to say that the people who do have money and know people in the political arena who have money to Lobby there case is a bit of center.
The people who are lucky enough to have large amounts of money and have mulitple horses also have top trainers who compete with these horses. These horses RARELY go out on a trail. They are too expensive to risk injury in a trail related accident.
This particular group of people usually do not lobby for local trail use.

As far as the horses and fertilization goes. Well, some riders do use the bags that carriages have in the city. These bags require special equipment to put on your saddle and also a bit of training. Most horses will kick out or buck with something new like this. For some equestrians this is too much time and money to make this work.

I do agree with you that the equestrian community is more organized than the MTB community. You are required to register your horses and to check them for particular diseases. But just like with everything else there are always going to be people who break the rules and make life difficult for everyone else.

Maybe like aluckyfiji said you and your local MTB group and some barns in the area can get together and have a day to help each other clean the trails.

I cleaned trails many times when I was younger (not with a MTB group, but with my barn) and I really enjoyed it.