Because the market was oversold, sentiment negative, cycles / seasonality turning positive so the market was ready to move upward. You need to question your assumptions about the relevance of government data, which also is lagging data.
I would just say "you would think we would have fallen 15%" rather than actually should have. Otherwise, I pretty much agree with you on everything else. The fact we didn't, the fact that the S&P and NDX both finished up on the week, was pretty telling. If you're trying to trade based on how...