Tourist, that's all well and good of you not to hold anyone up whilst you rummage through the bins but whet then? Then you (maybe not you but others definitely) hold the bag in such a way that it takes up standing room that someone could have used thus preventing them from getting out for a couple more seconds as your bag makes its way through the exit.
What happens when you drop it and people start tripping over it causing everyone behind to get stuck and die from smoke inhalation?
What happens when someone else with an even bigger bag sees you taking your bag out the bin and thinks they can do the same but holds people up?
What happens when the smouldering fire that you couldn't see because you were on the wrong side of the cabin suddenly erupts and those few seconds delay you caused mean a couple of people die?
Selfish is all it is. If the crew say get out now and leave stuff behind, guess why they say it?