I think I made a compelling argument for zombies in there. I wanted to go into how much easier it is to stop a robot uprising versus a zombie uprising but I was already getting pretty high in the word count. I mean, come on, one large EMP burst and all tech is toast (zombies shrug and possibly mutate into something deadlier), hack into the wi-fi network and trash their OS (zombies: wi-what?), build a time machine and kill the mother of the... no wait, the robots did that one.

Zombies have to be taken out by groups of people around the world, compared to one talented programmer doing it all remotely. You gotsta get up close and
personal with a zombie!