The heroes of Persona 4 miss many a glaring contradiction in their investigation of the kidnappings and subsequent murders taking place in their hometown. One particularly explicit use of the idiot ball is when the entire team leaves a known potential victim completely unprotected so that they can apprehend a balding, overweight voyeur climbing up a telephone pole in broad daylight, believing him to be the true culprit. It seems highly unlikely that a group of high school students would mistake such a character for a villain who up to that point had been so discreet and efficient that even the police didn't have the slightest idea regarding his identity. They were encouraged by inept policeman Adachi, who wanted to clear the team out for the real kidnapper, but this is hardly an excuse.
- A similar and possibly worse example is the team's conviction that Mitsuo was the murderer even after he made statements that outright contradicted things they knew about the case and had no idea who several of the former kidnap victims were.
- Even worse is the scene leading up to Nanako's kidnapping. Neither Dojima nor his nephew Yu think that Yu might be able to demonstrate his claims of being able to enter TVs by sticking his hand in the one not ten feet away. Trained policeman Dojima then proceeds to leave his daughter alone and unprotected, immediately after Yu receives a letter threatening someone close to him with death.
- Let's be honest. Taro Namatame had this going on too. All the while he was "saving" people and he never once considered that the TV world and the Midnight Channel might be connected to each other. If he had thought of that, he might have considered that the TV world had caused the deaths of Mayumi Yamano and Saki Konishi. To his credit, he later admits he was being really dumb.
Namatame: I didn't think for myself at all. That's why I couldn't save them.