But analogies are not always wrong, and those that were wrong in the past could prove correct today. One of the arguments for the Vietnam War was the so-called domino theory.  If South Vietnam was to fall to the Communists, other countries in South-East Asia would tumble before Communist insurgency.
但这类比喻也并不总是错的，而且以前一些被认为是谬误的如今也被证明有理。其中一个支持发动越战的论点就是所谓的多米诺骨牌效应，认为如果南越落到了共产分子手里，那么随后其他东南亚国家也会纷纷被共产主义运动所颠覆。