Its undoubtable that the show and its fandom has improved the moral and overal emotionall well being of many people. However, that doesn't mean that the show is targeting those with depression or other negative emotional problems. I think that most of this is due in part to the fandom. The fandom is full of people with many similarities. This means that not only are the people going to help you, but there is a greater chance that they'll understand you as well, thus improving.
To conlcude, it's not so much the show that is improving the moral and emotions of people, but more of the fandoms fault.