Simon Byrne, the Chief Constable of Northern Ireland’s beleaguered police force, has stepped down. It’s about time. The country’s police service, created to oversee a changing society in the aftermath of the Good Friday agreement, has been reeling from a succession of scandals. These stories – not least involving the leak of details about 10,000 police officers and staff on the internet – have had a catastrophic impact on trust inside and outside the organisation.