And, according to a piece in the CS Monitor, yesterday, they pose the greatest threat of any other source to the continued viability of USer public lands for any other purposes.
I think off-roading by powered machinery should be banned entirely. It utterly fucks up the places where it is done. It disturbs animal populations, destroys ecosystems, creates disastrous run-off problems, and ruins the natural features of the land.
It has no redeeming social value at all, unless in the occasional accidental deaths of one or more of its speedier and less careful practitioners. Unless you think the highest value for those lands is that they should be shredded and trashed by the spinning tires and shrieking motors of substitute penises by thrill-seekers and mechanical show-offs to test their mettle and metal.
Just because you can drive a truck into the wilderness does not confer upon one the absolute right to do so. Given what is known about their effects, they should be banned from all public lands.
But there will be a horrible, political fight over the issue. Some folks do not seem to realize they are NOT entitled to screw up everything for everybody else.
Although I would, of COURSE, never advocate for violence, a few booby-trapped trails might convince 'em otherwise, n'est pas?