Katiepoes
Based on this thread (and not in the least surprising) I have an image, in a real emergency where speed matters and there may not be enough life-boat places, of Mumsnetters barging to the front, children in their arms and fighting it out with the young single men for first place.
Unfortunately 'feminsim' has not given them a secret strength potion, so being equal but not the same (as anyone with the slightest clue about feminism understands), in this instance those without male partners fighting for them will lose out.
Of course people with children think their children are the most important people in the world and that they, as their carer, are more important than anyone without a child. I don't think it should be such a surprise that people without children, or travelling alone, may think that they themselves are the most important people in the world and are not all that interested in you or your children - once the veneer of civility and rationality has evaporated.
As Onlyaninja said, there's a massive difference between a situation where all can survive and one where some won't. Speed of evacuation - so orderly or panicked - also makes a massive difference. In a speed-evacuation with some order, smaller people have to be allowed first to avoid being trampled. Loved the 'unallocated seats' example, it doesn't take much for people to behave blatantly selfishly and through life experience generally, I've never doubted the capacity of young men in particular to be utterly selfish (not doubting that capacity, buried a little deeper, in others either).