Ok Dog....
Lets try another way....what markings were on the side of the aircraft? Lifeflight, Lifeguard, Air Life....did the aircraft have EMS interiors, were the aircraft licensed as ambulances? Did the crews have something besides a Red Cross CPR certification? The mere fact they were EMS aircraft and were returning from an EMS mission makes it an EMS related event...elsewise they would have been home snug in their beds and not been up flying.
Are you suggesting helicopters should not fly after dark?
If I can send a student off on a solo night cross country...why should professional pilots not be able to fly in the dark? (....and do so safely?)
Do we crash more aircraft after dark?
What is intrinsically different between day and night flying that makes Night EMS ops so dangerous?
We know flying single engine over open water is hazardous....particularly if the sea state exceeds the capability of the emergency float system on the aircraft...but that does not slow down the offshore industry in the Gulf of Mexico.
What is your point Dog? Assert yourself here....make your case?