Because iPad sales sucked and the new iTouches could not counter the decline in that segment. Plus aapl shares rose days before the numbers release and were locked in with the results. When there are noticeable negatives in a otherwise awesome earnings report, the shorts will use that as a excuse to take profits since the stock has risen quite a bit in recent days.
I think the market has discarded that wisdom. Thanks to hi-speed trading, it's now possible to go beyond even "friends with benefits." Heck, you can hook-up -- without even being friends, or having a clue who the 'friend' is. A few milliseconds is all it takes to raise (or lose) a few pennies a share. (Is that what was going on in yesterday's after-hours trading?)
So it's pleasure to have been long AAPL for a long time. And the view "going forward" (as business types like to say) suggests we could grow old together quite happily.