NTSB reports usually look like that, especially when there are fatalities and the aircraft has not issued a distress call. Investigators measure impact heights on trees, go to great lengths to find missing pieces of the aircraft, interview witnesses, inspect aircraft records and sometimes try to recreate conditions that could have led to the accident. They possibly did take more care with the JKF case than with the average, but the report certainly isn't bizarre.
Here are a couple of typical fatal accident investigation reports from the NTSB. My sympathy to anyone who knows these people, but we can improve safety through learning about their deaths.
http://www.ntsb.gov/aviation/LAX/lnarr_96A189.htm
http://www.ntsb.gov/aviation/FTW/lnarr_96A230.htm