What irks me is when Leno and Letterman make too much fun of the terrorist threat, which is very real. Tonight Leno makes fun of 4 year old threats, but what if we ignored them and the Prudential building came down and thousands died? Sure it is great to get up-to-date info on terrorists, but in real life you work with what you've got.
Letterman seems to have forgotten 9/11/2001 and when people wondered if it was alright to laugh again. People who would laugh at terrorist attack warnings would also laugh at funerals.