I think the point is that it shouldn't and doesn't matter what the situation is - if you think someone might need help, you offer assistance. Whether or not they packed too big a bag, or didn't think to bring toys to entertain their toddler while waiting for a plane, or whatever. I prefer to think of it as common decency, since the definition of chivalry includes only acts toward women. And I'm not perfect at this either, but I can tell with my 2 boys that it makes a difference when they see me do something, rather than just talking about it with them.