If the American police operators manage with 2 crew why do the UK need a crew of 3? 2 passengers and pilot?
Maybe because on a pursuit ( or other high profile incident ) the American Airborne Law Enforcement Agencies have the "luxury"
of being accompanied by a fleet of News Choppers to back them up with imagery and even directing troops on the ground at times,
plus if they do have to land to get "Hands On", the pilots are sworn Police Officers
Oh, and they also only have one engine to fly, so only half the workload
Nail