The Anchoress quotes Terry Pratchett's "Going Postal" with respect to all the things our government has declared "To Big to Fail." But the same quote seems to sum up Maciel, the Legion, and why people keep holding on.
Of course, Terry Pratchett is a genius when it comes to human nature, even if he doesn't understand the Divine at all. He's like Joss Whedon in that sense. A great artist can create things that teach about the Truth, even when he doesn't understand it himself. When he strives to be 'authentic' he hits the Truth without seeing it.
Anyway, if you're planning on taking my advice from earlier today about reading, and you enjoy humor and fantasy, it's hard to go wrong with some good Pratchett!