The author says that a mistaken view is held by some of the forensic scientists, but if it turned out that all forensic scientists held that view then that would hurt their argument that it's not forensic science in general that should be condemned (remember "some" doesn't preclude "all"). AC A defends against that potential objection by saying that it's not a view held by the majority of forensic scientists. That makes sense to me anyway.
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The author says that a mistaken view is held by some of the forensic scientists, but if it turned out that all forensic scientists held that view then that would hurt their argument that it's not forensic science in general that should be condemned (remember "some" doesn't preclude "all"). AC A defends against that potential objection by saying that it's not a view held by the majority of forensic scientists. That makes sense to me anyway.