I guess the message from that TV show was that even brainy people can be clueless when it comes to something like a CEL glowing in their face.
However, I have to say that it is a sad part of human nature to try to convert almost anything unpleasant into a “normal” situation. As a school counselor, I was told by countless parents of jailbird kids that “every teenager has an arrest record”.
Because I maintained a very good relationship with the local PD, I was kept informed about those who had been arrested, and the actual statistic was something on the order of 3% or 4% of the students who had ever been arrested. However, it apparently gave the parents of those kids some mental solace to believe that every kid was a jailbird like their own offspring.
Similarly, there seem to be a lot of people who think that “everyone” is driving around with a glowing CEL. I guess it’s better–in the short term–than dealing with reality. In the long term… nope!