tl;dr they want the oil to literally build "a trillion artificial minds," fight a genocidal race war, and maybe run to space. Also to power a bunch of Network States that will be surveillance security states - lotta AI, lotta camera, lotta data centers, etc. They want it, because the future they envision can't happen without it. And they want to secure it now, because they know it's only going to get harder as more of the planet burns.They'll do fresh water just as hard eventually.