United 93: Too Soon?

People have objected to the upcoming movie United 93 on the grounds that it's "too soon" after September 11th to make a movie about the attacks. Though I disagree (I actually think it's not nearly soon enough) I respect the views of those who object to the movie. I will point out, though, for purposes of reference, that within a year of the Pearl Harbor attack, Hollywood had made five movies (broadly speaking) about the attack:

Secret Agent of Japan

Little Tokyo, USA

Across the Pacific

Remember Pearl Harbor

Submarine Raider

Another three movies (December 7th, Air Force and Blood on the Sun) were released within four years of the Pearl Harbor attack.