Maximum of reality shows wanted our attention towards their episodes so that that they can increase T.R.P of show.I am not saying that all the producers are like this .Some are their who really wants to educate or create awareness about their lifestyle.They will be one in 1000 people.
They use advantage of these specific groups to increase their business
A lot of the popular reality shows seem to carry on stereotypes of specific groups of people rather than show us parts of their lifestyle that we may not have known before or have been misinformed. This may be because producers feel as if showing stereotypical situations would be more entertaining, thus bringing in a lot of views. It just seems to me that most of these reality shows are not as "real" as we think, and it's likely they are partially or fully scripted. On average, documentaries have more realism than a lot of the popular reality shows.