Bangladesh, Oct. 2 -- It is hardly a little-known fact that Donald J. Trump does not merely possess an ego. He appears to be in a long-term, exclusive and extremely public relationship with it. Few political figures in modern history have made their own personality such a central part of their political identity.

From outside the United States, this phenomenon is particularly striking.

We have seen wealthy businessmen, political leaders and celebrities cultivate enormous egos. It is hardly unusual. People who build companies, fortunes or political movements generally need a powerful belief in themselves. Without confidence, ambition often goes nowhere.

But Trump is different.

He does not attempt to conceal his ego behind carefully ma...