Obviously the show is grade A copaganda. Fincher has always really loved the idea of a bunch of unhinged psychos lurking behind every corner to get you. Really plays into the thesis of Programmed to Kill, which is that the feds/CIA created the idea of the serial killer to cause fear and chaos in the public so that we would welcome the police state we currently live in.
There is an element of that but there is also an element of serial killers being perceived as greasy oddballs with no friends or social skills