Obviously your local TeeVee station ain't sending a news team all over the country to produce these pieces. A public relations company will produce a slick quasi-news segment to promote a client's new product or service. We paid attention when the healthcast VNRs popped up on the local TeeVee news. There is no disclaimer saying that the segment is prepared by a public relations firm and therefore might be slanted. There's not enough reporters to cover everything.
Deadlines squeeze the schedule.
It takes considerable time to go out, interview some people, and then edit the footage into a story with a script. From the VNR company's POV, it's not their fault if a TV station only uses the polished version. Pay attention, especially when the health reporter says you can get more info from a Web site. Unlike most viewers, we followed her suggestion. We checked the station's Web site and discovered that the slick features were created and packaged by some company in another state that tries to promote the latest info on medical discoveries.