Explain why taxpayers pay out billions to Microsoft and get nothing in return
petitions.whitehouse.gov
petitions.whitehouse.gov
Rather than a hysterical (and frankly, ridiculous) demand for an explanation, why not simply ask that the US follow the lead of the UK government which has mandated a preference for open source software.
EDIT: This guy: http://www.youtube.com/watch?v=1e1zzna-dNw