If all of the top Govt officials are dead, and theres almost no one running the country after an atomic bomb. The military would detain, watch or question the 'Main Core' persons . If our country ever had an atomic strike, there would be most likely anarchy and lawlessness after, and is a scary thought. So, watching, questioning and detaining people who are noted to be hostile is a good thing so our country could be put back together again. I think it would also keep our country from getting taken over and turned into something other than america.
Like all those anti-American Japanese citizens we detained during World War 2? You can't give that kind of power to a government, or allow them to act on a plan like that.