What I personally think were people who only watch footage with no prior traumatic experience should be diagnosed if presented with anxiety and stress, is the one that is not mentioned within the DSM IV TR, nor do clinicians generally move towards from what I know about it, being: Disorders of Extreme Stress Not Otherwise Specified (DESNOS). These fit persons with symptoms that are not fully progmatic of other disorders, and is curable, opposed to PTSD, which is not curable.

When I read about people being diagnosed with PTSD after one or two months from a traumatic incident, then within a few months showing no symptoms at all and never present symptoms again, truly shoudn't off been diagnosed in the first place with PTSD, because the very nature of PTSD itself has no cure, thus theoretically speaking, you should not be capable of being diagnosed with a non-curable disorder then months later showing no symptoms ever again of the disorder. The type of cases should be more suited into other categorizations IMHO, or DESNOS, where if the person presents more intensity and rise too their symptoms in twelve months, a clinician can always then upgrade their diagnosis to PTSD and other diagosis as determined by the symptoms.