Another justification is that an institution with a detailed knowledge of the region is likely to be better able to sound an early warning of a crisis through its surveillance systems.
Presented by DJ Zane Lowe, the Most Punk show followed a language warning with the sound of an elderly woman reading a raft of swear words and sexual phrases at 1900 BST.
When brick-ends started hurtling perilously close to my unprotected head and to those of my cameraman and sound recordist, a police superintendant marched sternly towards us with awarning that his officers could no longer guarantee our safety.