I have some pretty big issues with your guilt-by-association hypothesis, but on the whole that was much more restrained than I was expecting. Bravo.
My big question to everyone: How do we wanna RP this? Black Death? Wrath of the gods? Rampant scurvy?
How about Alison using cultists to poison them in preparation for a coup? Imagine! If the player and others involved were cool with that, otherwise i really like the plague idea. Might even give some people RP reason to leave Aurvandil.
And in response to the whole world ganging up on Aurvandil being cheating: False. Players from all over worked together over IG years to make that happen and it still did not go as hoped (logistics being what they are). I do believe it's time to let go of it all though, both IC and OOC.