I think that as reasoning adults (most of us here are), we can agree that it makes sense to do what we can to conserve/preserve our recreational environments. Through experience we learn how our actions affect the environment. Where I grew up, we could hack, chop cut, build shelters with whatever materials we wanted in the "woods". The woods there were small tracts bordering our fields and like the fields, belonged to us. What trees there were were scrub varieties... quick growing and of no real commercial or esthetic value. They were in fact odd corners of land left over when the fields were cleared by my grandfather in the depression years. There was no real downside to doing as our hearts desired there and they made for great learning labs. Cane, willow and hackberry, a few pin oaks and pecans, most of which regrew in a single season and overcame our "improvements".
Living in an upland hardwood forest was a whole different ballgame. Growth was different, and management was different. Then came coastal planes pine land. DIfferent again. Now I am on hardwood/pine mix and cedar is the scrub. I can do whatever I want with the cedar on my farm. MY FARM. I treat other people's land and public land differently. It would also be different if I lived in the tropics where lush growth continues year round. Or if I were in the frozen North like some of you are. It does bother me no end to go to a public area and see where Nimrod Jr. has hacked on the trees just because he was bored, or felt like destroying something.
All that said, practicing brush shelter building in the city isn't hard. Go to a construction site and cut branches from the bulldozed piles of trees and take them home. Or take them to a park. Or talk to a landowner or mill operator who is doing clearcutting or select cutting on a parcel and get permissin to carry off a trunk full of slash.
As bad as clearcutting looks, it is actually much more benificial to wildlife and the health of the forest than "preserving". Yeah we all like to see old growth forests, but to wildlife they are deserts devoid of forbs, grasses and other edibles. Not to mention fire hazards. The key is moderation and selective harvest.
Codger