One would have work hard to fairly apportion blame for problems in the EMS industry:
First, the FAA for regulating EMS as "just another phase of the Air Taxi industry". No magic risk assessment grids, no matter how many check lists are required, EMS isn't just another air charter, even when the pilot's isolated from the medical side. This is more like "Dustoff" of 40 years ago, and the accident pattern shows it.
Next, the industry- using the air taxi minimums as official endorsement of minimum requirements. Part 135 training doesn't amount to a good introductory course for the job. What's done is done half-arsed. I can't think of a single time that memorizing a filter bypass pressure differential was applicable in the real world, much less the knowledge that a dog's digestive juices are twice the strength of a humans' (actual test subjects).
In all fairness, I have to admit that EMS pilots contribute their fair share to the problem, and pay for it.
Better training. Better scheduling. Better support. NVGs.