I'm having trouble figuring out why it matters if fairies are human/insect hybrids or not... After all, it doesn't change anything other than the nominal categorization they are put under. They still have the same characteristics and features whichever way you define them as. A rose by any other name and all that.
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"If you ain't laughin', you ain't livin'" - Carlos Mencia
Detective: Obviously, the cause of this woman's death was a broken spine which occurred as a result of the woman's breasts rapidly increasing in size for some unknown reason!
Assistant: Silly me, here I thought the 5,000 lb crate we found on top of her might have had something to do with it.