In the BBC’s riveting Line of Duty a week ago, the plot involved a police decision to raid a brothel. It put at risk the arrest of the leaders of an organised crime group, because priority had to be given to rescuing the women they had enslaved.

It wasn’t clear whether the officer who made this judgment call did so out of sensitivity to the political climate or concern for the welfare of the women involved.

Regardless, the decision to prioritise sentiment at the expense of the most important goal — or to put it another way, for the police to behave more like social workers than law enforcement officers — rang all too true. It was a shrewd observation by the series creator, Jed Mercurio. In…