I don' t see it as unethical at all, but it can be dangerous - and I wouldn' t recomend doing it on public land. But like the last " ethics" string that was going on here, there is unethical behavior that is legal. I' ve had it happen while turkey hunting and deer hunting.

If I am calling a bird in, and someone comes in and sets up between me and that bird knowing I was there (and I have had this happen)- he didn' t do anything illegal, but I don' t think he is being ethical in the least. Now when this happens, I make sure to do anything in my power to spook an otherwise incoming bird.

Deer hunting - Here in WA, most people site their rifles in at 200yds minimum - Your shots are a lot of times pretty far. When I bust my butt long before the crack of dawn (cross a river, scale a cliff, and climb what people on the east coast would consider a mountain) and set up before the sun comes up and some yahoo comes in at the crack of dawn, (actually two of them) and sit down closer than 50 yards from me scoping the exact same valley and shooting zones, though not illegal, it is far from ethical. Thankfully, as soon as the sun came up, they wandered off to try and run deer down and I was able to bag a nice 4x4 muley.