Given all that he knows and remembers, John struggles to let go of his anger about Jack’s youthful misdeeds. He understands that Jack didn’t actually
do anything to him. But he also implies that he can’t help viewing Jack’s failed fatherhood in light of losing his own child in infancy. The fact that Jack had the chance to be a father and wasted it, while John barely got that chance at all, grieves him terribly.