To Old Joe, the person responsible for taking what was his is someone named the Rainmaker, who is basically the all-powerful telekinetic Hitler of 2074, controlling everything in society from the government to the citizenry to the mobs and their operations. Old Joe’s intel (flimsy as it is) states that it was the Rainmaker who called for the retired loopers to start having their loops closed wholesale – and therefore was responsible for shattering Old Joe’s happiness. Old Joe’s plan, therefore, was to infiltrate the past, locate the Rainmaker (based on hospital records) when he is a young boy, kill him, spare himself (and, you know, maybe the world) a lot of darkness and heartache. Only, Old Joe has three names on a list (flimsy intel) – three children – who could be telekinetic Hitler, and therefore he must kill all three. Old Joe’s ambition for personal satisfaction is clearly exponentially worse than Young Joe’s.
Young Joe lands on a farm owned by Sara (Emily Blunt), a low-level telekinetic who is mother to a genius-level (and frighteningly powerful) telekinetic child named Cid (Pierce Gagnon), who will CLEARLY one day be the Rainmaker. Young Joe has that vulnerable side and heart opened up by the hard-luck story of Cid and Sara – especially Cid, whose story of violence and loss at a young age is so much like Young Joe’s own story. Even when Cid inadvertently blows up a gatman (Garrett Dillahunt), and Young Joe knows this kid is telekinetic Hitler, the compassion he sees Sara showing her son, and the effect it has, marks for Young Joe the difference between becoming men like him (and baby-killing future him), and possibly becoming what Young Joe secretly always wanted to be: a better kind of man.