Where to draw the line?

Although the point is to capture reality, there has to be a point where a line is drawn. I believe that a fimmaker/camera crew should be required to step in when those being filmed are going to harm their own lives or someone elses. Minor crimes are managable because they do make for good entertainment, but when someone is being dangerous and a harm to others, that is neither funny nor entertaining. I also that that a big part of the problem is the people who chose to be on reality television shows. The NY Times article talks about children witnessing their alcoholic mother being so drunk that she was throwing up on camera. That mother who chose to be on the show is leaving an everlasting image in her childrens' minds. She is the one who is in control of her actions and is being a terrible mother for exposing herself in front of millions. I think that the rules on interferring in reality tv shows should be clarifyed and all producers should have to follow them.