SonofZ3,
You're own logic fails itself. And here's where. The forests that we have, like the deer herd, are not the original forests. The situation has changed due to our past neglect.
Throughout the northern tier, since most of the area was logged completely, most of the trees are of the same general age. A diversity of species as well as ages are obviously the healthy, and original situation. Even if we left it go, it wouldn't be healthy for hundreds of years into the future. Small clearcuts and selective logging help correct this situation by adding diversity to the age of the trees. They are good for the forest and just about every woodland animal found within, provided it is allowed to grow back of course.
IMO, logging is a great story of how we learn from past mistakes. We did it wrong when we nearly totally logged off the forests of PA, and totally destroyed the habitat as a result. Now its being done fairly well and improving a bad situation.
Logging needs to be closely regulated, and for the most part, it is. I have a few gripes but they're minor. But ironically, because of past logging abuses, opposing logging in all forms is dangerous and damaging to the ecosystem.