As long as there was the slightest bit of hope left, the family opted for Caylee being kidnapped but alive. Who wouldn't? The alternative, that the baby was murdered by their own beloved daughter and sister, was not something they were willing to consider as long as Caylee was still missing. They held hope, however slight, that the horror would pass and someone would locate Caylee and bring her home safe and sound. Who can blame them?
MJ could not keep them from shooting themselves in the foot everytime they opened their mouths in front of cameras. They did not take his advice because it was not what they wanted to hear. Conway came into the public after the remains of a small child were found in the swamp around the corner from their house which had hair the same color as Caylee's still attached to the skull and no other children had been reported missing recently. They knew the odds of the remains being those of Caylee were enormous. When the remains were identified, we didn't hear from them again.
As CA stated early on, "show me proof" and then I will accept that Caylee is gone. When she got proof, she accepted it. Now they are dealing with the fact that the murder was intentional, another lump to swallow. What is left to say? KC destroyed everyone in her family when she killed Caylee and none of them will ever be the same again. PTSD? You bet. I would be chewing anti-depressants and anti-anxiety meds every day and using sleeping pills at night if I were in the same position. They can't bury Caylee, they can't visist KC (for whatever reason), they can't resume life as it was and for the foreseeable future, they will be going through unending heartbreak as KC is tried for murder.
If LE can give them a pass, I can too. JG forgives them for trying to pin him with the kidnapping and he was 100% more affected by this crime than any of us.
I do believe that they hindered the investigation, destroyed potential evidence, misled and even lied to LE, but this is really between LE and them.