Here we go again........
This has been debated over and over and usully goes nowhere. Heres how I see it.
#1. Its all about tolerance for all aspects of the hobby. Whether that be 3D'ers, helicopters, racers, park flyers, warbirds etc. etc.
#2 Saftey issues concerning 3D IMO are usually invalid. If I am hovering over the runway and lose it or have something fail its just going to plop down onto the ground and not go to far. Generally airspeed for 3D is at a walking speed. Compare that to someone doing a low fly by at full throttle over the runway if he loses it or has something fail........
#3 Why should one aspect of the RC community ( non 3Der's ) dictate how or where 3Der's fly?
#4 I agree that hovering in someones face while he is flying is rude but, why cant the 3D pilot do what he wants when he is in the air by himself or in the air with other 3Der's.
#5 The hobby went through this years ago when helicopters came onto the scene. They were new, they were different and they were over the runway for the most part. People eventually learned that just because it was something new and different didnt mean it was unsafe.
Tolerance and respect is what this boils down to people. .
(And personally, I think that anyone who says 3D is easy has never seriously tried it)