@Logicfest -- I'm not sure how much I like the term "societal norms." That definition is a moving target, after all. For example, homosexuality was once considered a psychological ailment, but that has largely changed in mainstream psychology. What else is considered abnormal now that might be seen as socially acceptable a decade or so from now?
The point, I think, is that getting people to conform to societal norms can be a good thing and a valid goal of psychologists. But what is considered normal is subject to change and therapists must keep up with those changes.