Why is Amreica so paranoid about Islam and Muslims?

This chart from the Economist reveals a depressingly troubling aspect of contemporary America:

Only 52 percent of those polled think a mosque is ok in a place where other religious worship places are ok?  And a 34 percent think there are some places where it is inappropriate to build mosques?

Oh, bloody depressing this is.

What a level of transparent bigotry, and a dissing of the Constitution itself ... what is wrong with my fellow citizens?

And, apparently Islam itself gets an unfavorable rating:

Only one-in-four has at least favorable or somewhat favorable opinion of Islam?

How did we end up here?