That's why the seat belt signs will be on. If they are going to do something really stupid, then they are not worth saving. I would be more concerned the cabin crew were safe and on a supply than giving any thought to idiots dropping a mask and moving around. Sometimes you cannot save people from their own stupidity. It's all there in the briefing (that they weren't watching). No point wasting any more time or effort on them. Maybe some of you would like people should only be allowed to travel if they have a 5 yearly certificate to show they have completed a ground training course in a safety training centre and been through all this nitty gritty training to get their certificate to permit them to fly? What else do some of you want? Or maybe just sitting for 3 minutes and watching the adequate safety briefing might suffice instead?