Please list the 30 countries that the United States has attacked. I will then ask you how the attack was an example of unjustified aggression. Please refer to actual historically accepted facts (the kind the History Channel uses for example). Of course the United States has never been afraid to take action when that action is justified. For example, Kosovo when the Serbians were slaughtering thousands of local muslim men women and children in death camps.
Or Somalia where Somali warlords were confiscating food aid to gain power over the starving people. Or how about Korea when the North Koreans decided that they wanted to have control over South Korea. I know South Koreans and I can assure you they did not want to be invaded by the North and are VERY grateful for American intervention. Or how about the brutal Iraqi invasion of Kuwait. I can assure you the Kuwaitis are very grateful the United States led an effort to remove Saddams's pillaging raping armies. And actually most Iraqis (Shiites and Kurds who make up majority of Iraq)are grateful for the defeat and removal of the elitist Baathist regime. Only the Sunni's, who lost their priviledged postions and status are unhappy.