As a grad and an IP to many a USAFA grad, I have steadily reinforced my theory that the Zoo is a personality force multiplier. (Blanket STS)
If you enter the academy as a fairly well-adjusted, normal person, you'll come out just fine.
If you are a sheltered introvert with nerdy tendencies & high marks in school, you will come out of there a massive turbodork.
In between these extremes, fairly minor personality flaws can be amplified to major issues; i.e. the desire to skate around inspections & parades & such often translates into an aversion to checklist discipline, chairflying, & studying. For others, UPT ends up being an extension of the college experience they never had, so they go a little crazy.
With all that being said, I can honestly say I haven't seen more USAFA grads wash out than any other demographic, but it seems like the really spectacular washouts are zoomies. However, that may be a perception flaw in that some folks tend to be predisposed to expect a certain level of professionalism from academy kids, so the ones that wash out are often more remembered.