For a broader perspective of why Pat Robertson's theology of judgement is so bigoted and destructive, note the following words from Anthea Butler at the University of Pennsylvania:
Using "demons" to explain natural disasters is not anything new. What is new is how the language of the demonic has been used to describe a natural disaster that happens to anyone other than a Christian, and often, a Christian of European extraction. It is on par with the notion of "Slave-holding Christianity" about which Frederick Douglass spoke so eloquently in "What to a slave is the Fourth of July." What's more, this narrative of "curse" is used often to remind any person of color that if you go up against the white man, God is most likely to punish you in perpetuity. A recent example of this narrative of demonic activity was used by John Hagee and others to explain away what happened in Hurricane Katrina back in 2005.
God save us from people like Pat Robertson!