User blog comment:KidVegeta/Canonicity/@comment-2063411-20101008163207/@comment-3097771-20101008205446

"Also, i view everything which does not specifically contradict major/important established canon in the manga/TV show to be canon."

Filler are not, in and of themselves, non canon. They must first break canon to be bumped down to non canon status. The quote above shows my opinion on why.