The F.B.I. Files

I greatly admire the work of the FBI, but the TV series often makes the FBI looks like idiots taking vcredit for other peoples work. I just saw an episode where, after all the research by the FBI on a car jacker / killer, the actual arrest was made by a lone local policeman who saw a car drive by with the driver wearing a nylon mask. He pursued alone, no back was available for most of the arrest, and then after the arrest, the FBI calls a meeting and acts like they succeeded. Finding the killer was completely coincidental, it had nothing to do with the FBI.

I've seen other episodes where the FBI does less than perfect work, and that's ok, by why put them on national TV?