they'd get told not to do again end of.. the fact that what actually happened to them being incomprehensibly bad is lost on these witch hunters. There's absolutely no benefit to punishing this family any more.. they have had a punishment in spades..
it's worth noting this thread started with these people accusing them of the murder as they have over the years .... then their faced with this guy and the almost nailed on confirmation. A good person would apologise for that , but they just keep spitting .. regardless of their disgusting and false accusations over a 13 year period. I find that disgusting personally.
I could not help but laugh at these people when after they've spent 13 years shouting murderer at the parents that they've then had the gaul to revert to saying this guy us innocent until proven guilty... unbelievable.
Some want it to fit the crime. Follow the evidence is the only way.
They were wrong to leave them in my opinion. And to sedate them. They will of course have suffered massively. The loss of their child knowing their part by leaving her, the ongoing none stop abuse they've received from the press (proven) and general public, and also I'm sure of less importance, the loss of professional/public standing. I'm sure the PI's, legals etc has hit them financially.
Even if the guy confessed, they found a body corroborating and they were proven to have no involvement, some would still vilify them as monsters.

I don't believe they were ever charged with a crime which suggests the law saw no crime had taken place.