IMHO, the fault is Mr. Kim's. It was a tragic accident that did not have to occur.
My parents retired to Roseburg, OR, so I am quite familiar with the area in which Mr. Kim got lost. In conversations with my mother, she told me that it was snowing heavily that night. After dinner, the wise and prudent thing to do would have been to spend the night at a motel, and continue the trip the following morning.
I've read only snippets of the reporting, so I don't know how experienced Mr. Kim was at driving in snowy conditions. If my guess is correct, he was unfamiliar with driving under those conditions.
Understand where you are coming from. There are still many questions that need to be answered yet.
I think there is plenty of room to see everyone's mistakes with this tragedy.
James Kim certainly made his share and he paid. I think there is a lot of room for improvement in the process surrounding Search and Rescue and I think we need to get to the bottom of the questions surrounding this before we can improve it.
I think the Forest Service has a lot to be reviewed here - IMHO they have messed up pretty badly. James Kim certainly made fatal mistakes out there but he should have never even had the chance to get where he was.