My issue with this event is not so much the people not assisting in the defence from corruption. (Its a players choice which events they will attend or help with)
My issue is with the people deliberately drawing the AOE aggro over the NPC in the retaking at the assault on the risen priest. It only takes 2-3 of those Ice AOEs (which the NPC wont dodge) to kill it and reset. Its used as a farming tool to reset the event and restart to continuously refarm it. The escort event just gets repeated over and over as some person will always want to farm more. As such it doesn’t really matter if there is enough players to succeed at the event, the majority of the time someone will still make sure that killing the risen priest of grenth part of the chain fails.
My question for ANet is, does deliberately making the event fail (not an issue of non attendance, but deliberately getting the NPC killed) to refarm it count as an exploit or is this just a design feature issue?