Why can't people seem to distinguish between fiction and reality?

I think people can't seem to distinguish between fiction and reality because they seem to believe that whatever is on the TV is true just because it is on the TV. They think the TV portrays a true image of what actually goes on in a crime scene investigation and because they believe this it makes it harder for actual crime scene investigators to convince that someone is guilty or Innocent. I think that they should let people know that this is not how they really solve a crime and that it is much harder than people seem to think it is.