There is a fundamental flaw in the training of a therapist which is now finally being reviewed for change towards trauma, as that is that therapists are training to never assign blame to a patient, even if it the truth, along with telling them that they are at fault for something, if they clearly are. Therapist are literally trained to lie, as the current training dictates that this type of approach is retraumatizing, however; physicians are finally starting to see that to get through to the more severe end of the spectrum in PTSD, being the majority on this site, that they need to start encompassing honest over what might happen, ie. retraumatization.
That is part of the situation Anthony, the others are :
* a lack of experience with certain mental health problems such as PTSD
* an inner fear of the patient becoming angry or dissociating
* lack of information and formation for PTSD - I'm speaking with knowledge here as for the formation I had never prepared me to face PTSD patients, not with what I'm living now.
I'm sure there are other factors, but I can tell you that some Ts will go out of their way to get the information and suggestions from experts " OK what do I do when ... "