Good Question!
Now I'm going to beat my favourite drum in response.
The number one killer of helicopter pilots is power lines.
The amount of training new helicopter pilots get in managing powerlines is almost zip.
First, I was a helicopter mustering pilot. Did a year of that in the early eighties then did a fixed-wing ag rating. The amount of instruction I received in finding then avoiding powerlines showed me just how deficient my helicopter training was.
Why? Most Helicopter pilots spend their working lives in the same environment.
Think about it. Spending 50 hours teaching new pilot's to navigate has cut the death-rate from getting lost to almost nothing. Lets do the same for wire-strikes.