It is widely known that the rescue squads serving high mountain areas with treacherous weather save the lives of many mountain climbers every year.
Given that ...
It's widely known that rescue squads save the lives of lots of mountain climbers every year.
How can it be that ...
A lot of experienced climbers think that the only way to significantly reduce climbing deaths and injuries among climbers is to abolish the rescue squad.
Evaluate
Since we know rescue squads save the lives of climbers, how would getting rid of the rescue squad lead to fewer climbing deaths and injuries?
There must something else different in a world without rescue squads that would lead to fewer climbing deaths and injuries. Maybe having a rescue squad emboldens people to take risks they wouldn't otherwise take. It's like if you take away the safety net from a trapeze, a lot fewer people are going to attempt the trapeze, and so maybe you get a net reduction in trapeze injuries.
Goal
Look for something that would be different in a world without rescue squads, that could help explain fewer climbing deaths and injuries.