Glad they were found. Sounds like typical SoCal hikers. Shorts, t-shirt, maybe a bottle of water. People just don't appreciate the harsh terrain, variable temp, and lack of water. 85F (29C) day and 55F (12C) night is normal.
Weather-wise, this past week has been pretty mild, in fact fog hindered searching by helicopter in the area according to news reports.
But yes, it's very typical to see people out hiking with just the clothes on their back and maybe a bottle of water. If you're out there geared up in a backpack, you're generally in the minority.
From the LA Times:
Dr. Michael Ritter said Thursday that Cendoya would remain in the hospital for a few days and that the rescued hiker was hoping his ordeal would convince others to be better prepared.
"He is very concerned that we offer pointers to all the hikers out there so that they can take care," the doctor said.
(from: http://www.latimes.com/news/local/la-me-0405-hikers-20130405,0,7897433.story )
Maybe we'll start seeing more folks out on the trails with their backpacks.
It's a bummer to hear that one of the rescuers got injured in all of this. I hope the deputy makes a good recovery.