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Brave New World was written before WW2 and nukes- Common misconception there.
It's implied that once billions of people were wiped out in the wars, the global government stepped in to fill the void and were gladly welcomed. All past art, religion, free/critical thinking was replaced by Ford-progress-worship and sense-orgies to pleasure the mind. The people simply didn't care since they were happy.
If anyone was deemed dangerous to the system, they were removed from it and placed on remote islands or reservations away from anyone else.
Before he died, Huxley wrote that he believed the world was accelerating towards the world of Brave New World. Most people, once content with their distractions & pleasures, don't care for lofty ideals such as freedom, love, liberty, truth, justice, honor.
Heck, that's why China will probably not see another Tiananmen square. The masses there already have their tvs, movies, pop stars, music, crap to buy - what need do they have for "freedom"?
Again: I have to plug a great book - Jihad vs. McWorld: Terrorism's challenge to Democracy. It argues that the tribal conservatism of various groups (not just jihadists but fundamentalists - christians, all sorts) are pitted in an ideological struggle against pop-culture, consumerist, unbridaled-capitalism McWorld, and
both are enemies to Democracy and freedom around the globe.
It was written before 9/11 and predicted a future clash (the attacks) and limits to our freedoms (the patriot act). It is brilliantly written and thought out.