ISAIAH hoped it would be different. The day would come, he prophesied, when Israel could beat its swords into plowshares and its spears into pruning hooks. True, Israel today produces more than its share of plows and pruning hooks - but it produces even more swords and spears in the form of tanks, fighter jets, rockets, machine guns and military advisers. By Thomas L. Friedman No one here likes to talk about it, but Israel, with only 4 million people, has become one of the top ten arms exporters in the world and Israeli businessmen are among the world's leading...