Sarah doesn’t cotton much to scripted pre-approved comments. She’s her own person and her comments are right off the cuff and likely not Bill O’Reilly’s way of doing things at Fox News (Bill has a lot of say on that network IMHO - look at his non-relationship with Michelle Malkin). Instead they value the commentary of Geraldo, Alan Colmes and other regulars who epitomize liberalism.
O'Reilly has regular, recurring segments with Bernie Goldberg, Glenn Beck, Monica Crowley, Charles Krauthammer, Brit Hume, Mary Katharine Ham, Dennis Miller, Adam Corolla, et al. He's even gone on tour with Beck and Miller. It's very disingenuous of you to mention the only 2 liberals he has on regularly and not mention the many more conservative regulars.