Answer:
He thinks that they are saboteurs. Munson makes the key point that they "are hampered as saboteurs because of their easily recognized physical appearance. It will be hard for them to get near anything to blow up if it is guarded ."
Step-by-step explanation:
Walter Lippmann, a journalist whose columns were carried by newspapers across the United States, argued that the only reason Japanese Americans had not yet been caught plotting an act of sabotage was that they were waiting to strike when it would be most effective.