And yet as an avid fan of the TV show Mayday, I can recall numerous instances where police took the lead in an investigation causing critical data that could have resulted in a proper understanding of all root causes of an accident to be lost. Personally I go with that whole "the needs of the many" argument, and would much rather see a proper investigation that results in improved safety for all rather than a narrow legal success that results in punitive damages against a limited number of parties.
...K