Two answers are suggested in the article:
- most evolutionists have not heard a [substantial] presentation of the case for creation, etc. and
- they assume that all the evidence...supports evolution.
Sure, if a disinterested person was given good reason to change their mind, one assumes that they would. But most evolutionists are not disinterested. They have a commitment, indeed, a religious commitment, to evolution's dogma.
Even should the evidence be overwhelming, many would retain their commitment because it is the basis for their world-concept and structures the foundational parameters of their life and understanding. To be persuaded they would have to, necessarily, change their intellectual, and spiritual allegiance from material which cuts them loose morally, epistemologically and ontologically to a person who seeks relationship and fellowship (with the converse if he, God, the creator, is rejected).
I think most evolutionists would understand this. Oddly, most Christians, being those who attempt the futile and non-credible amalgam of evolution and creation known as theistic evolution, don't see it. Odd, because one would think that Christians above all would understand that basic beliefs set the direction and preferences of the superstructure of understanding they support.