I think it *is* possible that Caylee drowned by accident when she was under Casey's care, rather than being deliberately murdered by her. Accidents of this nature occur every single day in the US (especially in the summer), and they occur to good, caring parents who unfortunately lose track of their toddlers just long enough for them to fall into a body of water and are unable to be revived.
I think it is possible that Casey was unable to accept the (at least partial) responsibility for Caylee's accidental death, creating a wholly fictional reality to explain Caylee's absence to avoid the overwhelming pain associated with Caylee's death. Unfortunately for Casey, she didn't think ahead to realize that when Caylee's death finally became known, she would then appear more like a murderer than a parent whose child suffered a horrible accident.
It's unfathomable that Casey wouldn't ultimately be taken to task for Caylee's disappearance at some point, but I think she believed that postponing the truth about Caylee's drowning was worth the life she would be able to live on the terms she wanted until the truth about Caylee's death was discovered.
This was incredibly foolish on her part, but we can't change the person that she is. She flew by the seat of her pants as to what to do with Caylee's body after her death, and made up lies to keep as many people at bay for as long as she could to avoid facing the guilt that she felt because Caylee had drowned by accident while under her care.
Eventually, the pressure from her immediate family caused her lies to cave in on her--and she still couldn't admit the truth to those who confronted her, including the State of Florida. This element of her nature will be forever debated, but probably never fully understood.
As for George being complicit in Caylee's death--that's a powerful tactic by the defense team to induce doubt in a jury who knows next to nothing compared to what members of this forum know to be true. By the end of this trial, we'll all learn how effective or ineffective this strategy ultimately became.
Like it or not, this is what defense attorneys do to minimize punishment for their clients, or possibly even exonerate them. As absurd or as reprehensible as it may seem to you, Baez is just doing the job he has been asked to fulfill in the American system of justice.
Whether this requires an adherence to the truth on his part, to save Casey's life, perhaps, is a *completely* separate issue.