It is the end of the world as we know it, 97% of the worlds population have been turned into a walking army of undead, and now it is left up to 3% of the population that is left, to rebuild, kill, survive, thrive, and repopulate.
This story has to have relationships to make it reasonable. That is why it is so accurate...
If this happened right now and me and my wife were in a safe place (after a year or so), we would be popping out some babies so that we could build our ranks and in the end survive as a race.
Just my views.
And Prism... This is another reason I have a gun... In case this ever happens! lol