There is a scene in You Were Never Really Here (2017) where Joe interrogates a wounded government agent in his home's kitchen. The agent says: "I don't want it out. There's always crying. All of it is ..." Which at first angers Joe, but eventually Joe seemed to have reconciled with the agent - they were holding hands and singing a song together.
This does not seem to make much sense.
What did the agent mean and why did Joe forgive him for killing his mother?