The judgment competent reasoners exhibit in deciding when reasoning should not be used to resolve disagreements is eroded by adopting the popular strategy of ascending to higher levels of generality. That strategy encourages disputants to believeoften incorrectly-that they stand on some common ground that can be exploited to reach agreement. But if we regularly assume that we share values and interests with our opponents in seemingly intractable disputes, we risk losing the ability to judge whether or not we share enough. (...) And when we lose track of the difference between promising and unpromising conditions for reasoning, we end up trying to reason at the wrong times. Such reasoning can in turn seriously damage our reasoning skills themselves. (shrink)