Taking cabin baggage is not a considered decision
There are many comments treating the decision by some passengers to take baggage during evacuation as if this is a considered decision by the passengers, if this was the case it would be not just stupid but reckless.
The reality however is that passengers will be surprised and shocked. I would expect many of them to be confused and in confusion fall back onto habitual patterns of behaviour however inappropriate.
There shoudl be research into how best to alleviate this problem. Prosecution should only be considered if the research shows it would make a significant difference. Personally I think improved briefing/communications would work better but the point is to research it. If prosecutions are made then the chances are that those prosecuted are simply confused and disorientated rather than deliberately cuplable. I could accept this if it can be show that prosecuting what are effectively victims will reduce further deaths but only if that can be shown. I think the morality of prosecution is dubious even in that case.