Every time there's an evacuation, we always get the usual droning on about pax taking their bags.
What do pax do every normal flight? They grab their bags and get off.
What do people do when frightened? They revert to type.
If you want to stop them taking their bags in an evacuation, put them in the hold.
Until the airlines are prepared to do this, there's not much point complaining about our passengers' behaviour, is there?