Why? (Although I don't know if it would help the fair use claim anyway.)
1. Earnings of 501(c) organizations can't inure to the benefit of individual shareholders.
2. 501(c) organizations can't actively engage in politics and influencing legislation.
3. Public disclosure requirements and accountability.
Just to name a few of the more obvious problems. Of course, some of these problems might exist as a matter of law, regardless of 501(c) status, by accepting donations and holding one's self out as a non-profit or charity.