It's a shame to see in the replies that the 'avid cyclist' daughter of somebody has been banned from cycling to school by their parent because they don't want to wear a helmet.
From the sounds of it another, different copper is showing schoolchildren a damaged helmet and telling the kids it saved her life. And accuracy is vital, PC Massie says.
Oxford Safer School police officer tells his followers a plastic hat definitely saved his mate's life, offers his "no helmet no bike" rule:
https://twitter.com/russmassie/status/1217453357851430913
That's an official police account, he's in uniform.