Why does Yahoo remove valid questions?

A few weeks ago, I asked a question: "Is the USA an Autocracy?" I went on to elaborate: "Based on the the Bush Administration's use of Executive Orders, Signing Statements, and the ignoring of Judicial injunctions, it has effectively cut out the other two Branches of American Government. Has the USA become an Autocracy, and if so, who is really in charge?" This question was removed by Yahoo. Why does Yahoo remove such questions? Is it due to their ties to ATT?