I wonder if this is partly an extension of what you might call "confirmation culture", which could be described as a way of avoiding disgrace/humiliation. For

I wonder if this is partly an extension of what you might call "confirmation culture", which could be described as a way of avoiding disgrace/humiliation. For instance, when applying for a promotion, I've heard that in Japanese culture it is common to get pre-approval from various parties beforehand so that it is ensured before a formal/public application is made; this way, nobody is disgraced by being turned down. Not sure how true that is. But it could apply to the justice system in a similar way; having a high conviction rate means the justice system is effective, whereas trying someone and not convicting them might make the justice system look bad.