I'm American, and I can say that I for one find the whole of the Korean peninsula full of naive/whiny or megalomaniacal/insane bastards. I'm sick and tired of being S. Korea's "ally", especially when they actively thwart our diplomatic initiatives against the North.
I say we leave, let them suffer a ridiculously huge and costly war, and let the Japanese re-seize control of the peninsula. There, motherfuckers, PROBLEM SOLVED.