I'm with Fynn. It was my understanding that people simply weren't very aware that mako was essentially the lifestream. Or that the lifestream was a real thing. My perspective of the lifestream is that it was viewed in a similar way in which people view God on Earth. As for what's outside of Midgar - how many people do you think went outside Midgar? And when they did, who's to say that they really cared? There are places all over planet Earth in which lakes are disappearing, life is being wiped out, rainforests are being cut down... and we just carry on. Do we really care that much? I dunno. I mean, I donate to a jaguar charity (which is effectively a rainforest charity) but I don't feel that I'm making a massive difference. And yet here I continue to be that way. I think it's very easy to turn a blind eye in this world, and that would probably apply to Gaia, too.