Reading Joe's post about materialism, a somewhat different point of view occurred to me regarding what materialism does to people.
Given what we know, about reincarnation, karma, densities, and so on, we have some long-term goals that go beyond one lifetime. We understand there's so much we don't know it's hard to even imagine (I mean, just think of the intelligence and knowledge of those who designed all this life on Earth. We're like bacteria in comparison.), and we want to know more, to learn, to understand, to become better than we are now. We want to create things and help others on their way. We strive towards something beyond this lifetime.
Materialism takes that away. There are no goals beyond this life. So what is left? Whatever you can get in this life. And this is where the massive propaganda, consumerism, and all kinds of manipulation come in. Materialism takes away your focus on something more, and then the machinery of STS manipulation has an unlimited playing field. They tell you what it is you want. Look here, buy this, go over there. They give you an endless stream of distractions so you never really understand anything of substance. You're trapped in their game. And materialism is sort of the foundation for this trap.