Because very strong fundamental macroenomic forces are pushing rates higher. Examples: US trade deficits, US budget deficits.
Because interest rates cycle from high to low to high--and we've just passed the low point for this cycle. Rates have already reached historic lows. You thought such rates were here to stay, perhaps?
We're back down into the 5's on the 30-Year Fixed, with rates being pushed up by signs of a stronger economy. Thing is, there is no inflation and THAT'S what drives interest rates.
No but the rates are tied to the growth of money, as well as the demand for money. It is not necessarily ordained that they go higher at this point.