Political scientist: People become unenthusiastic about voting if they believe that important problems can be addressed only by large numbers of people drastically changing their attitudes and that such attitudinal changes generally do not result from government action. The decreasing voter turnout is thus entirely due to a growing conviction that politicians cannot solve the most important problems. The reasoning in the political scientist's argument is most vulnerable to criticism on the grounds that the argument ['undermines its claim that people no longer believe there are political solutions to important problems by suggesting that people are dissatisfied with politicians', 'presumes, without providing justification, that there is no cause of decreasing voter turnout other than the belief that few important problems can be solved by government action', 'presumes, without providing justification, that there are no political solutions to the most important problems', "infers that important problems can be seriously addressed if people's attitudes do change from the premise that these problems cannot be addressed if people's attitudes do not change"]