Christian love is what a Watchtower member considers their cardinal attribute. They will quote the Apostle Paul's definition of love in a heartbeat because they are convicted that they do their best to live up to it.
In the Watchtower world the members are instructed to always be setting "spiritual goals." Their prefered state is one where they are constantly driving towards something spritual. Every person differs in speed and intensity while applying this concept imparted upon them by their Governing Body. They are instructed to watch each other specifically looking for flaws in one another. This is in the name of the protection of their place in God's love and in demonstration of their obedience to him through his earthly leaders. While they watch each other, internally cataloging their spiritual shortcomings, they are fed each week "spiritual food" that gives "encouragement" as to what a "true Christian" believes, thinks and acts.
All Witnesses know they are being watched. They also know what they are being watched for as they all get the same material/instructions. Their emotional brain's then attach their survival within the group to the "list" provided from "God's weekly spiritual food."
When a Witness reads the Apostle Paul's words about true love they actually believe they make that cut because in their minds survival has been a success. When a person lives their life under constant scrutiny from all social directions they just start living to survive.