You've got to be kidding me. Just look at the posts on this thread.
If the Antis were convinced that she would overturn RvW there would be very little opposition from those calling themselves conservative. No reasonable arguments against Harriet have been made that I have seen. It is pique and resentment that a favorite wasn't chosen.
Many would rather see a flaming conservative go down in defeat that to have one just as conservative confirmed without a big fight.