I'll say 60/40% FAIR
Being that Roberts has worked on camera for most of his life it's hard for me to believe that he wouldnt know what was going on around him.
He's putting as if he was just acting during some of the scenes which clearly was not the case.
I do on the other hand have sympathy in the fact that some very personal moments and information became public while either under an intoxicated state or caused by emotional situations.
While taking advantage of this was very unethical it was Roberts who put himself into the situations knowing that it could be flipped in any direction.
Being someone who has been around people with drug problems most of my life I can tell you that one of the greatest effects of drugs and alcohol addiction is the day after syndrome of "it's not my fault", "I didn't know or I didn't do it".
So it was wrong for Barry Bernsteins to take advantage or trick the Snake, but Roberts should take the blame for his own actions and find away to get over it.