I would wager most people who say the above quote in defense of their actions are doing something that only "works" in the sense of accomplishing one specific goal at the expense of others.
Tell that to John Cage
I can divorce my wife by beating her to death. Things can work, but that doesn't stop them from being stupid.
Part of what makes it difficult is figuring out whether you're "faking it" or not.
Speaking of movies, I love Three Kings for this:
Archie Gates: You're scared, right?
Conrad Vig: Maybe.
Archie Gates: The way it works is, you do the thing you're scared shitless of, and you get the courage AFTER you do it, not before you do it.
Conrad Vig: That's a dumbass way to work. It should be the other way around.
Archie Gates: I know. That's the way it works.
A similar example, from a Chris Farley movie:
Tommy: Let's think about this for a sec, Ted, why do they put a guarantee on a box? Hmm, very interesting.
Ted: I'm listening.
Tommy: Here's how I see it. A guy puts a guarantee on the box 'cause he wants you to fell all warm and toasty inside.
Ted: Yeah, makes a man feel good.
Tommy: 'Course it does. Ya think if you leave that box under your pillow at night, the Guarantee Fairy might come by and leave a quarter.
Ted: What's your point?
Tommy: The point is, how do you know the Guarantee Fairy isn't a crazy glue sniffer? "Building model airplanes" says the little fairy, but we're not buying it. Next thing you know, there's money missing off the dresser and your daughter's knocked up, I seen it a hundred times.
Ted: But why do they put a guarantee on the box then?
Tommy: Because they know all they sold ya was a guaranteed piece of shit. That's all it is. Hey, if you want me to take a dump in a box and mark it guaranteed, I will. I got spare time. But for right now, for your sake, for your daughter's sake, ya might wanna think about buying a quality item from me.