I like to keep track of a possibly meaningless statistic: Googling ‘design’ + ‘homeland security’. Today’s total, at 1,310,000, is up 20,000 on a month ago. But I have a feeling the the security-through-fear bubble may be deflating. One sign that people may not be as scared as the industry would like: Jason Coster-Mullen drove a 600-pound, shiny steel replica of “Little Boy,” the bomb dropped on Hiroshima, 800 miles across the United States in the back of his car and no one stopped or questioned him.