This is simple, but for most of us, it's impossible to comprehend. IF we have had any kind of affection and love from parents, a parent, a caregiver, then we feel gratitude and love for those people and we honor them with respectful actions as adults.
Since we aren't usually narcissistic sociopaths, we can't understand how Casey coudl do most of the things she did or how her parents seemingly " overlooked" them.
Let's look at this with Shirley's words in mind- Did Casey hate Cindy more than she loved Caylee? OBVIOUSLY, but Caylee was also Casey's pawn, the Ace in the hole for Casey for almost 3 years.
IF Casey could have delayed Caylee's speech or made her deaf or mute, then she might have used her trump card successfully for a few more years. Caylee was disposed of when she stopped being a compliant pawn, starting to cry over situations that were unpleasant to a child, to talk, etc.
How Casey got away with sleeping around, stealing, not working, lying about every day, drugging, drinking- it's hard to imagine, yet so simple once Caylee entered the world and was placed in CINDY'S arms.
Remember the early statement from Casey to Cindy about how Cindy held Caylee first?
This set the stage for the entire life of Caylee Marie Anthony.
Cindy transferred the love and protective feelings she had for Casey at one time in their lives onto liittle precious, innocent Caylee. Caylee was Cindy and George's chance to " get it right" with a child, albeit a granddaughter.
Casey isn't stupid, not when it comes to using what works.
What worked was threatening to take Caylee away from the Anthony household if George and Cindy didn't give into whatever Casey wanted, whatever it was. They weren't to question, or berate, or even LOOK at Casey closely, not if they wanted Caylee in their lives.
Casey stole, lied, slept around, took drugs, drank, possibly had photos on the Internet that were pornographic in nature, lied about working for at least 2 years, lied about a babysitter for at least 2 years, and from the looks of things, the Anthonys believed the lies. OR did they?
It doesn't matter what they believed about Casey's life, what they KNEW was that Caylee was the precious family member, and they would not risk having her taken out of their lives to who knows where with who knows whom with Casey.
I am absolutely, positively certain that Casey kept bags packed and keys ready to roll in that house. All she had to do was pick up Caylee and say " OK, you don't believe me or support me, WE are gone. She's mine and I'm taking her".
When that happened, the Anthonys relented because the benefits of having Caylee in their lives, and them in hers, outweighed the " problem child" that Casey had become. And there are probably short instances of fighting between parents and Casey where Casey DID leave with Caylee prior to the day she was murdered. As soon as they gave in, Casey returned with THEIR Caylee.
Casey knows how to use people to get what she wants, and she used Caylee every day of the child's life once a bond formed between grandparents and baby.
The extreme anger Casey must have felt when she left after her big fight with Cindy must have been building for so long. As well as resentment that a little snot nosed brat could get the love from her parents that she couldn't any longer. Casey traded in things and appearances. Not love. She didn't understand true love, obviously.