This land is only preserved from development because people are willing to pay taxes for the government to monitor and fence the land, and pay higher property values because there's less land for development.
If you want people to be OK with those costs, it really helps for them to be able to actually go and see the beautiful land that they are preserving. It's not reasonable to expect people to care about nature of you don't let them experience it.
Really we should designate more areas as wilderness. i.e. no machinery. Humans can still enjoy the land without roaring across them in 4x4s.
To clarify: In your view, someone using a vehicle to access a remote area is not "enjoying the land"?
Perhaps you mean that the presence of a motorized vehicle reduces your own enjoyment.
(Personal bias: I am an avid mountain biker, occasional dirt bike rider, and feel the wilderness designation is harsh and used excessively).