ALL 'fuel' is an ORGANIC compound except liquid HYDROGEN (as far as I know). All fuel needs some kind of 'oxidizer' to burn: IE liquid OXYGEN.
Even if we found LAKES of this stuff on the surface (we won't) it takes POWER, of some type, to process ANYTHING to get it to a useable form.
Now the only type of power available on MARS is SOLAR (unless we haul a nuclear reactor up there)
This 'idea' does not appear to have been thought out to far.................
Actually, this idea has been thought out to an incredible extent. You might want to read Report on the Construction and Operation of a Mars In-Situ Propellant Production Unit by Robert Zubrin, Steve Price, Larry Mason, and Larry Clark of Martin Marietta Astronautics before you rant:
>The following is a report on a project to build and operate a chemical synthesis unit representing the core of a machine capable of manufacturing rocket propellant primarily out of indigenous materials freely available on the surface of the planet Mars. The project, which was carried out at Martin Marietta astronautics in Denver, Colorado between October 1993 and January 1994, was funded by the New Initiatives Office of NASA's Johnson Space Center in Houston, Texas. David Kaplan was the JSC program manager, and Steve Price was the project manager at Martin Marietta..."