Myside bias in thinking about abortion

College-student subjects made notes about the morality of early abortion, as if they were preparing for a class discussion. Analysis of the quality of their arguments suggests that a distinction can be made between arguments based on well-supported warrants and those based on warrants that are easily criticized. The subjects also evaluated notes made by other, hypothetical, students preparing for the same discussion. Most subjects evaluated the set of arguments as better when the arguments were all on one side than when both sides were presented, even when the hypothetical subject was on the opposite side of the issue from the evaluator. Subjects who favored onesidedness also tended to make one-sided arguments themselves. The results suggests that “myside bias” is partly caused by beliefs about what makes