Because the company's financials are not declining. It's not a 1:1 relationship when it comes to AAPL. All indications are that Apple has a monster qtr, but "unnamed sources" are driving the stock down.
If apples numbers on Wednesday justify the drop in stock price, then ok. But there's no indication that that's the case other than these unnamed sources.
Att said they had a record qtr for iPhones.
Verizon says that had a "higher mix" of iPhones sold in the qtr
Apple sold five million phones in three days in the US
Apple sold two million phones (without China mobile) in three days in China
Apple had the fastest rollout in their history for the iPhone 5
The mini is a huge hit as verified by apple
With all these confirmed sources, why is the stock down?
Like I said, if they start reporting declines in sales, revenues, profits then yes it's time to worry. But apple may be the only company in the planet that can make 8 billion dollars/qtr and still be a "miss"
Stocks are not priced on what the company did yesterday. Instead, they are priced based upon what one expects will happen in the future. That is why stock indexes are treated as leading indicators. Generally, the time frame is thought to be around 6 months, or two calendar quarters.
Clearly, as of late, many investors think Apple will be unable to continue growing profits at its recent pace. Each factor you cite is insufficient to make Apple investors think that tomorrow will be more profitable than yesterday.