It was a stupid risk, they said as much. Why are you insisting on self-flagellation?
They are the victims here (assuming they are telling the truth).
I don't blame people for being taken advantage of by a conman. I might advise them not to be so trusting, but I don't go around demanding they publicly take full responsibility for being the victim of a scam.
A signifiant point of the post is to say that they learned something, and they hope others can learn from it too. Maybe the issue is you didn't read the full article?