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.
Serial killers would most likely still be serial killers, unless strong indicators like child abuse and traumatic head injuries can be prevented/cured entirely. Or well, they maybe wouldnt be "serial" killers if cop shit develops far enough but most communists I know would of course cut down on surveillance and profiling and shit for obvious reasons.