>>18946099Japanese police are notorious for coaxing victims and families to not press charges. If a daughter is raped police will say "think of what the neighbours will say" and that was often enough to pressure a family into keeping their daughter quiet over a daterape. A lot of violent crime and sexual assault goes under-reported in Japan for this reason. Unless the victim is someone important or the crime gets media attention early, the Japanese police prefer to bury it rather than take it to trial unless they have a very clear cut confession from a suspect.
There are cases when a hobo is found dead in an alley, obviously beaten, but because he is a Korean mentally ill homeless person they classify it as a heart attack since an unsolved murder would worry the community and bring political pressure on the police. There was even a case when a young sumo student who was bullied to death had police refuse to investigate, and they quickly cremated the body before an autopsy could be carried out. The family of the victim was pissed but it would have been a difficult case to prosecute, so they police felt obligated to cover it up.
Politicians put pressure on police to cover up or under-report crime to make the public feel safer, and use third world tier torture methods when interrogating suspects to force confessions from innocent people. Police will simply arrest a known criminal randomly and force them to confess to a crime they are currently investigating for the sake of convenience.
tl;dr
Japan is a first world country with the police force of a central American dictatorship.