Four adults in a C-172 on a hot day at around 9000 Ft MSL in a mountain valley?
Pilot should have known better, and not taken trusting and unsuspecting pax for a fatal sightseeing flight.
Reminds of the similar Piper Archer accident at Diavolezza in 2017, and of the Ju-52 at Piz Segnas in 2018.