Iraq has very few parallels to Vietnam. If you think so then point them out. But I bet you're just parroting the liberal talking points.
Also, Iraq signed a treaty to end a war AFTER they'd invaded a neighboring country, raped, burned and destroyed. The treaty stated that war would end if they obeyed certain conditions. They BROKE that treaty over and over again. Just as if a felon breaks probation, the original sentence kicks in. Saddam's original sentence was to have his army destroyed, his palaces bombed and his life ended. A nation honors it's agreements or they stop having any infuence in the world. They become another UN, no real power, nothing but talk that can be safely ignored.
Do you really equate a legitimate pre-emptive strike, such as if Isreal strikes Iran's nuclear facilities, with a totalitarian nation like North Korea attacking their peaceful, democratic neighbor, South Korea? In the first case, Iran is an entity that has publicly stated that Isreal should be wiped off the map, then is known to be developing a nuclear bomb. In the second case South Korea has offered nothing but peace and financial assistance to their neighbor.
If you can't see the difference you need more help then you can find here.