It is not his fault that the airplane broke.
Agreed.
As a Devil's advocate point, though, it's also not a VFR pilot's fault when
the weather closes in and traps them at a remote airport. But it's still
the renter's responsiblity to get that plane back home so that other people
can use it, even if it means paying for two IFR club members to come get the
plane.
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