Sure.
The first 3 possibilities are pretty serious charges, and would need some kind of corroborative evidence from other reputable sources.
The fourth possibility tallies very well with my own personal impression of having watched most of the episodes.
If it turns out the PS guys could not help them, then that's a shame, but I guess they were limited to a few days time with them.
(As a caveat, I found it a bit disappointing that at the end of every episode I watched there was a message to the effect that, in some sense, things had improved. Over a sample of 40 or 50 cases that's not a position that's easy to believe. If, for example, in 2 or 3 cases they had said there had been no improvement, or even a deterioration, then it would have added credibility... but then it's a TV show, with producers and big money involved. Regarding the individual 'investigators' seen on screen, they seem pretty sincere IMO.)