It could be as simple as Blaine's role message reading something like, "When the Aiel invaded, you were eager to fight back, and joined the Children of Light to repel them." It's referring to the Aiel invading the wetlands, but it can easily be misread as the Aiel invading Amacadia, especially if someone is hurry to catch up and assuming the game is in "modern day", not 20 years in the past.

I'd even accept the explanation that Blaine embellished his past, maybe adding motivations when trying to paraphrase and reading between the lines. I frown heavily on that, and would be more willing to lynch if that is the case, but I think it's more likely a simple misunderstanding and not embellishment, hence not lynch-worthy.