The relationship between the people who use drugs in this particular jurisdiction and the police is not a good one. There's not a lot of trust, so the community often takes care of itself. They try to manage the overdose on their own without calling 911. There was some earlier discussion about having people dragged onto the front porches of houses. Then 911 is called and the person hides in the bushes and waits for the paramedics to arrive. The fear is very real.
People will make decisions or they'll hesitate or they won't call.