Let's take a look at this more closely...
Everything that looks so horrible, unseemly or suspicious about how people are behaving in this case, ( family, Sam, lawyers), If we are mistaken, and Sam is telling the truth, (We're not. He's lying imo, but IF)...
If SA really did think there was glass there, then every single thing they are doing makes perfect sense.
It was still poor judgement of course to put Chloe on the rail, because she could have still gotten hurt, but most likely she would have just slapped at the glass and all would be well....
So, If SA, mom, dad ect... were 100% telling the truth, and the authorities were spinning it differently right from the jump, as angry as they undoubtedly are at Sam, they might be moved to fight back against, what could be seen as an attack on their family and a misrepresentation of how the accident occurred.
Everything that they are doing makes perfect sense under those circumstances and is really the only thing that ever made wonder for a second, "What if we are the ones who are "wrong" and they really are are telling the truth? That would be a terrible, terrible, predicament, because no one will ever believe them. Not. Ever.
And there will always be a small chance, that we don't actually know what we all seem so certain of.
There are people who believe she was deliberately murdered. I get frustrated by the insistence of those people, so I can only imagine how infuriating it would be to be falsely accused and have the entire world believe your a guilty liar. ( Like the Ramsey's, even after being formally acquitted, they'll be "guilty" forever, even though no one can prove it!).
I will be very interested in what the PC forensic team have to say about that video footage. Yes, indeed...