What is on our minds? (Is it always good)

Not always are things on our minds good, sometimes the not so good things are also on our minds.  And yes all of us have those thoughts.  Do we act on them?  I know for myself I sometimes do, because I want too. Does the media influence those thoughts;  The Bad Girls Club, The Girls Next Door, Deal or No Deal, Survival, Real TV, Tory and Dean, The Kardashians. Do these show serve any purpose; or are they only entertainment.  Why do these show appeal to us?