As for HEMS, there is far less evidence they actually save lives. In fact none.
Would love to see whatever data you have on that little claim as I've seen the contrary with my own eyes, and have friends who are only alive because HEMS was around.
Still, regardless of whether or not they prevent an actual death from occurring, does it not save society money when someone with a traumatic brain injury can make it to neurosurgery quickly and make a complete recovery? Or how about making the difference between someone who makes a full recovery from a heart attack vs having enough permanent damage to their heart so that they are unable to have any sort of quality of life?
In either of these situations, patients will live, but quality of life and what they can contribute to society would be another story.
But then again, this is about police helicopters...