A camera wouldn't have prevented anything, it would only make blame slightly easier.
Blame isn't necessarily the important thing for the outcome of an investigation. It is important to determine fault for the sake of preventing future failures. Did the crew flip the wrong switch, or did the system change state without the crew doing anything? Is there a training issue, or an overwork issue, or design flaw, or a maintenance problem?
You can't answer these questions without knowing the sequence of events prior to the failure, and the flight recorder data that shows a system state change might not be enough if you can't determine how or why that change happened.
Again?