I’ll make a suggestion. A couple of decades ago, women complaining of rape were treated very skeptically by the police, with the result that many women were reluctant to go to them.
Campaigners succeeded in changing the culture, leading to a presumption that all accusations are true. “Always believe victims”, they say (where people making allegations are automatically regarded as “victims”).
The claim is made that the rate of false accusations is very low (2% is often claimed, though this figures has no real basis to it), and thus treating all allegations as true is justified.
So maybe the police really have now adopted that culture, where the person accused is nearly inevitably guilty in their eyes, and their job is to find the evidence to prove that, not to objectively assess the evidence.