wataru hiraizumi : newly confident `` when you look back at what the 20th century was all about , '' says wataru hiraizumi , slowly sucking on a piece of swiss candy , `` the big problem was not the cold war , but the question of germany , japan and the u.s. `` and the biggest problem of the three , he makes clear , is the u.s. `` people do n't realize how dangerous the u.s. can be . ''