It depends on what you mean in “hurting the trail”. If you mean ecologically, then I would halfway agree with you. I disagree with the “aeration theory”, because the trails our not our front lawns which need human maintenence to hold our desired character for them. Besides, the amount of soil compaction probably outweighs any increase in aerated surface area. Don’t fool yourself or others in thinking that you’re doing the trail a favor by punching 1/4" holes along the tread’s width for 2000 miles.
Yet I will agree that this amount of impact is not something that will cause great deal of ecosystem damage. For instance, a study done on 700 miles of the Smokies trail system condition pointed out that the entire disturbed area was not even 1% of the Park area. But the impacts on the trail are still a concern not mostly because of environmental impacts, but because of how visitors percieve those impacts. Social surveys and my own personal experience have suggested that people care greatly about the condition of the trails.
No one is trying to ban poles or condem their use. Like most other aspects of hiking, low-impact skills can help preserve the natural character of the trails.
Tha Wookie