It kind of takes the edge off the suspense when literally every single human character starts acting like a complete moron all of a sudden. In order:
1. Shuichiro Todo puts multiple artworks on display at the university that depict multiple of the murder victims' corpses accurately. Whether or not he's the real killer, it's incredibly stupid.
2. Junya sees a picture of one of the victims that he recognizes since he found the victim himself. Rather than tell the police about it, he decides to head over to the suspected serial killer's house by himself.
3. Kyoko has a panic attack because she thinks she caused Junya's death by giving him the whereabouts of the suspect, which she tells Rei about while being comforted. Subsequently, (4.) Rei decides to do the exact same thing Junya did, although this is even dumber because he knows Todo drew multiple of the victims and not just one, so if he did go to the police his testimony would be like 1000% more convincing since it links Todo to multiple victims, but no, he's gonna go confront him by himself. Back to Kyoko's stupidity, she immediately caves and gives him the info even though she knows he is most likely walking to meet the same fate Junya did, for no apparent logical motive.
So yeah, everyone's an idiot.