The "respect" for nature shown by offroad enthusiasts is documented by all the cans, bottles and wrappers they toss on scenic trails. The Rubicon near Lake Tahoe shows how these anthropocentric mouth-breathers view the land. They can't be bothered carrying a trash bag and packing it out. No room in the Jeep or some other excuse.
People with a conquer-nature mentality have little respect for its sanctity. The show stealer is their fancy machinery, not the land. Nature is just another place to make noise and whoop it up. It's hard to prove, but the number of offroad litterers is probably at least 25%. It goes beyond a few rotten apples making the rest look bad.
It's very simple: people who bash environmentalism don't respect the environment that much. They talk of "extremism" but effective protection will always seem extreme to those who want land UNprotected. Environmental problems are people problems and more people create more impact. Population can't continue without stealing more land. That's the crux of all these conflicts. It's not about shadowy entities trying to block your rights, it's more people fighting over less acreage.
In the lower 48 states, there's no real frontier left. We don't need more machines, noise and trail(er) trash invading the last wild, quiet places. Be happy with all the trails you've got. If you find those trails overcrowded, blame human overbreeding, not environmentalism.
R. Lander