Ahmadinejad, at Columbia, Parries and Puzzles

The story of the day yesterday.

His speech at Columbia, in advance of his planned speech today at the United Nations, produced a day of intense protests and counterprotests around the campus. It was a performance at once both defiant — he said Iran could not recognize Israel “because it is based on ethnic discrimination, occupation and usurpation and it consistently threatens its neighbors” — and conciliatory — he said he wanted to visit ground zero to “show my respect” for what he called “a tragic event.”

And he said that even if the Holocaust did occur, the Palestinians should not pay the price for it.

He began the afternoon on the defensive.

Lee C. Bollinger, the president of Columbia, under intense attack for the invitation — one protester outside the campus auditorium where Mr. Ahmadinejad spoke passed out fliers that said, “Bollinger, too bad bin Laden is not available” — opened the event with a 10-minute verbal assault.

He said, “Mr. President, you exhibit all the signs of a petty and cruel dictator,” adding, “You are either brazenly provocative or astonishingly uneducated.”