You don't. Clearly, you have no flipping clue what you are talking about. While true you might have a good grasp of the GAME, you have no idea how the PLAYERS feel about this.
People rolled on PVE servers to avoid being griefed by the opposing faction. Forcing these players (myself included) to PVP to enjoy a world event is wrong.
Were you around during the Zombie Invasion event in World of Warcraft? Lemme sum it up for you: You got "Infected", you died, you came back for 5minutes as a zombie. How do you get infected? Get attacked by a zombie player. There was no "safe" zone, no sanctuary, nothing that would "Protect" you from getting infected until the very end of the event (they added healers that would cure you if you got close at the end).
I had more stuff thought but I lost my train of thought