Is there a way to design end game content that doesn't lead to a caustic community?

[Zaels]

Which is precisely the crux of the problem with the game's current nature.

But that doesn't make it a bad or shallow game. It's a common theme in mmorpgs where players have to put together parties where each person fills in a specific role crucial to the success of the fight. That makes it so people have to rely on each other.