I'll sure go with 2 out of those 3 and maybe all three with a slight modification.
1. "the other group says its just a game."
I am, most assuredly, right smack in the middle of this group.
2. "1 group says the ballistics and our gunnery skills allow it"
I'm in this group. Ballistics CLEARLY allow it. In fact, the case can be made that individual rounds DO NOT TRAVEL AS FAR in the game as they do in "RL". Gunnery skills? Again, what is the AVERAGE PLAYER hit percent? I'm guessing Joe Average shoots between 5-8%.
3. "1 group says d600+ kills never happen"
I'd say they happen but are not the COMMON kill. Additionally, there's that "previous damage" thing. Somebody whirls and swirls in a furious furball for 2 minutes taking a ping or three here and there from MG and/or Cannon. He survives and low on ammo he decides to RTB. As he egresses, somebody nails him with a short burst at 600. A wing comes off and he dies. The spew on Ch1 begins over the "bogus" kill.
Is it not possible, in fact likely, that this last burst was just "the straw that broke the wing spar's back"?
How many folks have had a "no previous damage" kill at 1k? 800? 700?
I think any honest person would agree that 600+ kills on a competent, maneuvering target that has NO PREVIOUS DAMAGE are rare in AH.
Now, if someone chooses to engage the A/P as they egress at 600 yards.....