Pacifism isn't viable when some of the biggest countries in the world are run by totalitarian regimes. Objections to participating in the military industrial complex are a luxury of countries verging on global irrelevance. The proclivities of the West to engage in self-flagellation over these issues are well known to and exploited by less liberal regimes. If only it were not so, but I don't know what the alternative is, just as the physicists in the Manhattan project saw no alternative.