It is up to politicians to listen carefully to power hungry coppers on an ego trip; nod earnestly, smile and then tell them to fuck off and get on with policing and keep their noses out of politics. Dodgy Dave may think it appropriate to stimulate debate. In a personal capacity as a citizen that is within his rights. As a serving police officer, this is politics and well outside his remit.
The same goes for calls for 90-day detention without trial by the criminally incompetent head of the Metropolitan Police, Sir Ian Blair.