With respect to those meanings of 'human' that are relevant to the morality of abortion, any fetus is less human than an adult pig.--Richard Dawkins' Tweet
Here is an example of the fallacy of flamboyance intended to draw attention. It worked! Dawkins has had about 10,000 responses.
The manner in which someone speaks can draw unwarranted support for a thesis or idea. Incisive wit, verbal facility, equanimity and repartee have no bearing on the soundness/legitimacy of a position. It is the essence of what is said, not the manner in which it is said, that counts. As Bertrand Russell once noted, the purpose of being educated is to defend ourselves against the seductions of eloquence.
Related reading: The Folly of Scientism by Austin L. Hughes; Scientists Against Scientism; Kansas Science Bill Faces Defeat; Today's Savage Mind; Thomas Nagel: Neo-Darwinian Conception is False