Dr. Ruiz: Dr. Smith has expressed outspoken antismoking views in public.
Conclusion (clearly)
Dr. Smith cannot be included on a panel that examines the danger of secondhand cigarette smoke.
Evidence
Even though she's otherwise qualified, she has expressed outspoken antismoking views in public.
And we want to ensure that the panel examines the issue in an unbiased manner before coming to any conclusion.
Evaluate
The author is assuming that if you've already expressed outspoken views on an issue being studied, then, despite being qualified, we can't be sure you'd examine this issue in an unbiased manner before coming to any conclusion.
Goal
We need an answer to help us argue that Dr. Smith can still be a part of a panel. So maybe we argue that as long as you're qualified, you can be unbiased. Maybe we argue that anyone you try to grab for this panel is going to have already come to some conclusion about secondhand smoke, so we can't realistically use that as a disqualifier. Or maybe something else.