Detective? More like Det-ASS-I've.

I'm trying to figure out if the author is intentionally making the main character stupid. There's so many logical fallacies in his reasonings. Even in the first few chapters where he assumes the ml is the criminal cuz of his buff build and callouses. Acting like he never lifted weights at the gym before. He's also very rash...? You'd think they teach you to keep calm in school. Also why are you constantly threatening the criminal about catching his ass . I haven't gotten far in. Does he get more smart?