Philosopher: Scientists talk about the pursuit of truth, but, like most people, they are self-interested. Accordingly, the professional activities of most scientists are directed toward personal career enhancement, and only incidentally toward the pursuit of truth. Hence, the activities of the scientific community are largely directed toward enhancing the status of that community as a whole, and only incidentally toward the pursuit of truth.
The argument improperly infers that each and every scientist has a certain characteristic from the premise that most scientists have that characteristic. This flaw in reasoning weakens the philosopher's argument.