In my opinion...they don't WANT to prop up the dollar. The insiders have wanted to form an "American Union" for quite some time now. The only way to do that is to cause some pain for the Americans. If the dollar collapses, they'll be able to push us right into the "Amero" almost effortlessly.
Here's a good website. http://www.thenewamerican.com You can sometimes find a good article that is based in economics...and also discusses how the geopolitical scene can have a dramatic effect.