The threat would have at least 10 times as many people out on the streets in protest the following day/night, with the police's meagre resources thus split between ensuring public safety at the resulting demonstrations and minimising the impact of the night's youthful festivities criminal rampage.

Not to mention the millions of pounds then wasted on post-mortem inquiries into why the hell the police decided to do such a damn fool thing in an already tense and tricky situation.