Though John Mack was IMHO kind of naive in his approach to this matter, even he carefully examined his "clients" to weed out those who he felt were either fabricating the evidence or having psychotic experiences.
The Chris Bledsoe contacts are a great case in point. Bledsoe's experiences have been confirmed by many other people, some of which are UFOlogists and former government agents who were curious about his case.
I am still unsure what the hell is going on with Bledsoe, but there are plenty of corroborating accounts to back up his stories.
What Mack was actually doing was “testing the people” to weed out obvious kooks and liars—so I guess that is a form of testing the evidence.
However, he was totally baffled by the folks he did believe.
When confronted with contradictory claims (”aliens are good” vs “aliens are bad” for example) he had no real basis to decide either way, and no real criteria to figure out how to decide.
To me the main message of all this is that homo sapiens need to lose the arrogance that “this culture has figured it out”.
We haven’t figured out squat imho.
We may have to survive a million years to get even close....easier said than done....