Actually, taking the cultural blinkers off, there are vast swathes of people, particularly in some parts of the world, who have a very different understanding of what is dangerous and what is acceptable or not. Rules are often ignored. It's not necessary even for the front wheels to touch down to get out of seats and start retrieving carry on luggage, you only need the rear wheels to touch down. Same principles as the above mentioned. N. Icelandair (look it up

) . You see it on the road, you see it in the air, you see it all sorts of places. I guess one could expect better behaviour from international long haul passengers though, but this doesn't at all surprise me (it would if it was a MEL-SYD flight though).