[Viable story viruses need to be teachable and understandable for simplicity, hard to disprove and specific as absolute truth for conviction, and applicable to a wide range of people for spreadability.]
[To drive behaviour of its host, story viruses needs promises of pleasure or pain to create incentives, claims that your behaviour will be known to facilitate accountability, coverage of the spectrum that humans believe for comprehensiveness.]
[Story evolution favours the hosts who survive.]
[Dehumanization adds superglue to the story to make it not only okay but one's 'duty' to kill the other.]
[Having a supreme leader and identifying yourself with the story ('I am a [story]ist') creates the tribal mindset that enables larger groups of humans to act in concert.]
[A tribe's military fights external threats. The police fight cancer.]