How does Jack Salmon remain devoted and loving to both Susie and Abigail?

He's the loving father who knows the truth of his daughter's murder, but can't prove it ... the way, facing the truths of his world, and trying to keep his loved ones and himself ... Like the rest of the family (excluding perhaps Abigail) he believes in Susie's ... Man, if Harvey had gotten her, Jack would have probably died of guilt.