It is very freeing to let go of the denial. However, right now, denial is a useful tool for them. It's frustrating for observers, but it allows them to keep putting one foot in front of the other each day.Probably, and yet it seems to me it would be a tremendous relief to just face the truth and live with it. I know it's horrible, but the course they're on may be even more horrible.
I think we've seen glimpses of their realization that Casey is responsible for Caylee's death. When we see Cindy Anthony, her hands pressed tight against her mouth, rocking back and forth with her harms held so close to her body that it seems as though she's afraid that if she lets go, she will come apart, I think we are seeing her knowledge of the reality of the situation.
Right now, the horror is still so great that they probably can only tolerate the realization that their daughter is a monster in very small doses. Over time, it will become their reality. Right now, they can't let it. It's too terrifying.
Rookie, I agree that society contributes to a sense of entitlement in its members. But Casey Anthony was not created by society. Her self-indulgent friends may have been--but Casey Anthony is what she is because---she is.
I know we all crave answers to the WHY? WHY? WHY DID CAYLEE DIE? that weighs heavily on us. But there is simply not a rational explanation. We can't attribute this to anything other than the existence of a supremely evil young woman.