Duh? The objective is not to flumox the liberal she is debating, it's to persuade the audience. Acting like a pig, whether Coulter or Moore is not going to win friends and influence viewers.
One perfectly legitimate viewpoint is that the objective is to get people to buy your book. And the way you would do that is to inspire the people who might buy your book to decide that they are interested in it. And if you flummox the liberal host, that gives your book a buzz among the audience of potential buyers.You will object that that doesn't persuade "the middle". But in fact it puts the liberal on the defensive when your book outsells Hillary's. And getting the liberals on their heels and the conservatives on their toes is plenty good.
Imagine if every time liberals sneer, "McCarthyism" they are asked to explain exactly what they mean, and given no free passes in that explanation. Clintonite pettifoggery consists of refusing to concede a legitimate point, no matter what "It depends on the meaning of 'is'" absurdity you have to resort to. Coulterite backbone consists of refusing to concede an illegitimate point no matter how much bluster you are subjected to.