Earlier quoted context omitted.
Japan has a 99% conviction rate and indefinite uncharged detention happens often. Despite that people treat police amicably, and there is a trusting relationship. That's to me a sign that there is a fundamental cultural difference in Japanese attitude, in the US stats aren't anywhere as close to as severe, yet relations/trust is much worse. Goes to show how much of a productivity and effectiveness loss lack of trust…
There are about two ways to get a 99% conviction rate: run total kangaroo courts that only fail to convict when the defendant credibly threatens big problems if they get convicted, or just don't take cases that aren't open-and-shut to court in the first place. And while the kangaroo court thing is maybe a bit too true to be comfortable with, I'd wager Japan errs heavily on the side of not bringing potentially content…
Basically in Japan they err on the side of letting criminals roam free if it's not an open-and-shut case in front of a judge, but it sucks for the (very few) who are wrongfully convicted, because nobody will believe them. Especially because you'll never get the government to admit they wrongfully convicted someone.