Quading or 4x4ing into remote areas is bad no matter what the intention. The noise from these vehicles is one of the major reasons they disturb and damage sensitive areas; it is not just the visible damage.
Except for Government services all vehicles should be banned from off-road use in the forestry areas save certain areas such as MacLean <sp creek (an eye-sore of Alberta).
If you can't get there on foot (or mountain bike in some cases), then you can't go.
People that use off-road vehicles to gain access to remote areas are doing damage no matter how careful they are; and there seems to be a correlation between people who use these modes of transportation and people who disrespect the wilderness. And in many cases it is just laziness; walk, hike or bike......it is better for your health and the well-being of all living entities.
I would prefer not to smell exhaust, hear loud engines, and watch overweight beer-guts fly past me while fishing or hiking.