SAR varies a lot depending on the team, agency, and coordinator. I think it's reasonable to remind people that these are largely volunteer efforts, but it's also reasonable to call out and criticize problems with SAR when they arise. These can be due to poor training, insufficient funding, an inexperienced or unenthusiastic coordinator, or a corrupt sheriff's office. (They exist.)
It's been a while since I last read through Tom's stuff, but as I recall, his main gripe was with the Inyo County Sheriff's Office (and, in the Ewasko case, NPS).
And he's right: because SAR operations, in the US, usually fall under the management of law enforcement agencies, you get as side effects the usual problems associated with law enforcement -- poor information management, big egos, paranoia, credit-seeking, and an emphasis on security over getting the job done, among other problems. This is especially problematic on big incidents where multiple agencies are involved.
CalOES exists in part to get all the kids to play along in the same sandbox, but that sometimes doesn't happen until the operation gets enough attention for a CalOES bigwig to appear in person, and then suddenly the various sheriffs involved start acting like adults.
(Purely for background: I've been in SAR for several years, currently on a hiatus but was extremely active and responded to numerous incidents across the state. I was trained and certified in incident management, was a team leader, and an instructor for several different skillsets. I've butted heads with sheriffs a couple times and had my wrists slapped a time or two. Sometimes they were in the right, sometimes I was.)