In today’s installment of Cato Unbound, Clark Kent Ervin, former Inspector General of the Department of Homeland Security and author of Open Target: Where America is Vulnerable to Attack, strongly disagrees with John Mueller’s provocative lead essay, “Some Reflections on What, if Anything, “Are We Safer” Might Mean,” in this month’s issue devoted to “9/11 Five Years After: Reassessing Homeland Security and the Terrorist Threat.”