Redbadge
Explorer
Don't kid yourself in thinking it is just D&D (not that you are I'm just using your post as a springboard to this point). Vampire, Paranoia, Shadowrun... it seems that almost any game that issues a new edition causes some kind a strife among the fans.
Not limited to RPGs either.
I'm a huge NBA fan (see my pictures in the edition picture thread, also grats Mavs), and you can see it here as well. I've heard things like they don't have the heart they used to, they're all thugs now, Lebron will never be Jordan, etc. Actually, it kinda hurts the sport as a whole, when we should really just appreciate the game for what it is. Now that I'm getting my dad to watch again, I feel that things are changing for the better, although it might have also been helped by the irresistible drama created by Lebron and the Heat.
Maybe that's why we shouldn't encourage edition wars. Because all it does is hurt this hobby that we all love so much. The more we can be civil and respective of each other and different systems/playstyles, the more we can do what really matters, game.