To worry about a few lone nuts is to miss the forest for the trees. Conservative delusions are already actively harming the USA in many ways: we have the shittest quality of life of any developed nation (unless you include Brazil and Mexico), we have Bible-thumping morons trying to shoehorn religion and creationism into our schools, we have a weak & ineffectual labor movement, our public administration is shit because of years of "HURR GUBMINT IS BAD", and last but not least, we are awash in cheap booze, cheap drugs, cheap guns, and cheap (low-quality) food.
We're basically a fatter version of Pakistan, with more Humvees and flat-screens.