Steve over at eWeek recently posed the question of why Google didn't change their logo for 9/11.

Their are 1000s of reasons why they wouldn't do this. Most of all though, how could you change the logo once a year for something that is ongoing? 9/11 represents (whether you hate America or not) a time when the world changed and the battle of civilizations (sympethtic basic human beliefs vs. Islamic extremism) began. A battle that all non-extremist Muslims must join while aligning themselves with the west and its allies if they are going to save the Muslim religion. Because it is under attack, not by the west, but by human beings who have tracended the bounderies between good and true evil. Human beings that have shut out all of manking and are focused only on what they see as right and just.

Google was right not to change the logo.