Used to, when I ran into woos espousing the power of positive thinking, the idea that if you want something bad enough, you'll get it, I'd just take it as fluffy naive stuff, and generally move onto more directly harmful sorts of woo. I ended up reevaluating that attitude around the time I started blogging. The particular triggering incident involved an advocate of The Secret who saw no problem with an implied reversal of the hypothesis: If you're doing badly, it's your fault because you obviously attracted misfortune with negative thoughts. It got up to sickening levels when rape victims and the Holocaust came up.
I haven't heard as much from the Secretards over the past year, and I hope that's a sign the hype is dying away. At least until the next positive thinking fad gets a guest on Oprah.
Blaming the victim is one of woo's favorite ways to deal with failure. Much of the time it's not deliberate: Most woos are true believers, and when their pet magic fails, one of the easiest excuses to formulate is "you're doing it wrong!" With science-based things, it's a possibility, but there's always something to examine to figure out where the problem lies. No such luck with woo: There's always large realms of vagueness, and many give excuses to claim what the victim was thinking.
Of course, the knowing frauds take full advantage of this meme: If they can blame the people paying for their services and make them believe they're the ones to blame, the huckster doesn't have to worry about getting any results whatsoever. They can prosper from inaction and deception.