Also, from the sound of it (basically everything I know about FFTA I think I've gotten from this thread, which surely makes me extremely qualified to contribute to this discussion
), the cult members don't exactly have a lot of evidence the better world will even exist. It sounds like they're basically just going entirely off the word of the cult leader, which is filled with wild, fantastic stories about how much better everything will be for the people who will exist in the new world. And, by the way, even in his own claims he's not planning to sacrifice
himself to bring it about, just everyone else including all his followers;
he will get to live in the new utopia resting on their bodies. But it's okay, just like all the it-sure-looks-like-murder he's telling them to do, because none of these people are
real, anyway.
If he was leading a revolution to topple the nobility and institute a democracy with a legal system that at least attempted to be egalitarian, extensive protections for civil rights, investment in infrastructure for the public good, a voting franchise that
started with every surviving member of his victorious army and would be extended equally to everyone as fast as reconstruction allowed, sure, a lot of people might be willing to die for him so others could live better lives. Even if it was something like a fight to replace the Bad Dynasty And Nobles with a new Good Dynasty And Nobles drawn from the army, I could see that. But "Neither you nor anyone else are real, so elevate me to the true, better world on a tower of skulls and die joyful for my ascension, oh and the better lives other people will also have in that world"?