Here is an argument published by foreignpolicy.com exactly a year ago: One mistaken reason to avoid attacking North Korea is the fear of direct retaliation. The U.S. intelligence community has reportedly claimed that North Korea already has ballistic missiles with nuclear warheads that can reach as far as the United States. But this is almost certainly an exaggeration, or rather an anticipation of a future that could still be averted by prompt action. It’s true that North Korea could retaliate for any attack by using its conventional rocket artillery against the South Korean capital of Seoul and its surroundings, where almost 20 million inhabitants live within 35 miles of the armistice line. U.S. military officers have cited the fear of a “sea of fire” to justify inaction. But this vulnerability should not paralyze U.S. policy for one simple reason: It is very largely self-inflicted. [G]iven South Korea’s deliberate inaction over many years, any damage ultimately done to Seoul