what other people don't understand

"He still flinches at the naïveté  of graduate students who based their diagnosis on a battery of meaningless tests." 

            Mischel has spent a good amount of his life devoted to studying psychological science and diagnosing someone from the results of pointless tests, really bothers him. Say you were to observe someone trying to do something that you know how to do perfectly well, extremely wrong. For example, say you were walking through New York City at night and you were to observe a person trying to take a picture, but the flash on the camera is clearly not on. Now, wouldn't you get frustrated if you saw this same person continuously take the same picture and not figure out how to turn the flash on? I know I would. To me, that is something that is particularly simplistic, so it angers me to see someone clearly using the camera incorrectly. The same idea can explain how Mischel feels about graduate students who base their diagnoses on incorrect, "meaningless" tests. These frustrations are very normal when a person cares about a subject very strongly. In this case, Mischel agonizes over his fellow researchers' rushed results because he deeply cares about these studies and wants to have an outcome that has reliable evidence to support it. A real diagnosis can be made more wisely by a combination of analyses based on observations. This eliminates a "one size fits all" style of testing and conclusions. Having the experience that Mischel does in this field of study, gives him the knowledge of creating tests that are meaningful and accurately measure what they are supposed to be testing, resulting in proper diagnoses. Many of these graduate students Mischel refers to, are most likely analyzing their data incorrectly and using the wrong kinds of tests because they lack experience. In Mischel's eyes, they are wasting precious time analyzing inconclusive data and drawing meaningless conclusions. This directly affects Michel because it can hinder his dependable results instead of supporting them.