If the government is the one who is risking their firefighters and wasting resources because people are making stupid choices-- like hiking up a mountain in 121 degree weather. It's akin to governments closing the beach when there are rip-tides or e -coli/red- tide conditions. These same stupid people have an expectation that government emergency crews will be sent to save them from their stupidity.
Always swim perpendicular to the rip tides.
I don’t mind charging them for their rescues. But I live in southern AZ and am well adapted to heat. I can hike safely in 115 deg heat. Don’t do it often and I won’t lose sleep over it being banned, but I regularly RUN in 105 degree heat.