The Japanese police are not always the friendly helper though, especially when something not in their daily routine happens.

They're insanely rigid, almost always put arrested people in detention for maximum of 23 days even if they know the people are innocent, and they have a 99% conviction rate.

After living here for a couple of years, I feel that this is also closely linked to the highly homogeneous culture, where people are generally very friendly and kind to those who share the same origin, and can become unconsciously biased against people or things out of the "normal" world.