Thanks for your helpful and informative replies. Thanks especially to Leaving WT for supplying a ton of quotes! I had never realized what a hard-line stance the WT organization takes on Armageddon. I was under the apparently false impression that at different times, they'd said that people who have never been preached to will survive. But those quotes are clear.
I think that my confusion came from misunderstandings of WT doctrine by other JWs. On several occasions, I've heard from JWs that Jehovah will let those who haven't heard the good news live through Armageddon. And just a few weeks ago, I heard this brother say that only the "incorrigibly wicked" will be destroyed. It's clear that many JWs (including me, although I don't believe anymore) don't have a strong grasp of WT doctrine. It's probably worth asking why these doctrines aren't more clear in believers' minds. Do they block out the real, awful doctrine and replace it with a more pleasant version? Does the WT intentionally obscure their views on Armageddon by rarely bringing them up? It's really hard to say.
I'm also amazed that the WT comes right out and says that infants WILL DIE at Armageddon because of the sins of their parents. Yet we are supposed to believe that God is love? What kind of mind does it take to believe that God is loving and that he will slay innocent infants? A brainwashed mind.