People suffering cognitive decline (dementia, Alzheimer’s, or plain old age,) should have their TV consumption carefully monitored because they lose the ability to tell that the things they are seeing, like zombies, aren’t real.
This goes for the news, as well, and is why your older relatives send you so many stupid email forwards about politics and are irrationally hung up on whatever the news is talking about today. Their ability to understand what they are viewing declines while their fear of it increases. (Do not be cruel in return; they cannot help that they are aging.)
People blame political craziness on young people, but we have never before in all of history had such a large percent of the population in mental decline–and it is only going to get worse.