Unfortunately, failure of supervision is endemic in every government department from the military on up. At least, that's the way it is on this side of the pond, and I have been given no reason to suppose it is otherwise anywhere else , but plenty of reason to suppose it's the same.

Poor salaries and bad public perception means that, for much of the time, public or government service tend to draw on a mediocre recruitment pool compared to private industry (I was a Civil Servant, for instance). So for every truly dedicated, competent employee, there are about 100 time-serving, clock-watching mediocrities like me.

Until the culture around public service changes, things will at best improve only marginally. The killer (literally) is that in the case of the police, mediocrity costs lives!