Earlier quoted context omitted.
Why are there two different numbers? When there is an emergency you want people to always do the right thing. Guessing the wrong number to call is not the right thing, and worse 2 numbers means there is great chance you didn't memorize either. This is well studied in human factors. Besides, anytime the other two are involved the police need to respond too - when there is a fire or medical emergency whoever can get th…
"anytime the other two are involved the police need to respond too" This is not the US, the police does not show up to a fire or an emergency, why would they? They show up to an accident, and when you need an ambulance they will bring one. The will also not stop and interrogate you when you walk to the side of the road. People usually have no interaction with the police outside of speeding tickets. "get that first ca…
Because they're trained first-responders, who have medical first aid training, vehicles with lights and sirens to move quickly through traffic, knowledge of the local area to navigate around road closures or ambiguous location descriptions, etc.
There are many situations where multiple sub-specialties of first-responders (police, firefighters, EMT, etc) are useful. The police aren't just showing up to arrest or shoot people, in a functioning society they can and do provide valuable service in assisting injured people, controlling traffic around car accidents, etc.