Obviously the Vietnam War was started to contain communism from spreading throughout Asia. Communism was the "greatest enemy" of the United States during the Cold War and during the Vietnam War but that view changed to a less apathetic viewpoint on communism as the war dragged on. As the war lasted longer than any one previously, people started to become less interested in containing communism. It didn't seem to be a direct enemy to the US in Asia, and most people back in the US figured there was no real reason we needed to be killing the Vietnamese people and letting our soldiers die for the same reason.
This less apathetic viewpoint on war seems to be apparent today regarding the Iraq War. Not only do people claim that "we do not know who our real enemy is" but also claim that we have spent too much time in Iraq as it is. When President Bush ordered troops into Iraq in 2003, he had an approval rating 0f 96%. But as the war has raged on for 6 years, people are less concerned about "containing" terrorism and more interested in bringing the troops home.
Although it could be argued that we are winning in Iraq and that we should stay there, the general consensus with people at home is to bring the troops home (also the viewpoint of our President). To me, the Iraq War seems even more "mirky" as Ed described the Vietnam War to be. We are less aware of our enemy and it is getting harder for us to fight them in urban environments. I don't know if any of this makes sense to you guys, but I'm basically trying to compare the issue of communism to terrorism and how people originally supported fighting it, but when things got ugly, we turned our backs on the soldiers and supporters of the wars. Basically, was communism and or terrorism a palpable issue to fight against?