I think Serenity is actually saying that this man is a knob, not that he's 'right'. And it is true, unfortunately, that some of the tactics he seems to be advocating would work on vulnerable, unhappy people (whether that's to get sex from them, get money from them or generally gain power over them).
But people are not 'hardwired' to victimhood, and can learn to laugh at and walk away from predators. And many con artists are actually rubbish at the 'art' and the response they get is mockery rather than compliance. So in fact publicising blogs like this and laughing at them is a good way to encourage other people to react to this sort of approach in a healthy way ie with derision.