I commute to central London every day for work. Recently the trains on my line were changed to more modern ones with more open space but less seating. This sometimes means that although I live on one of the last stations on the line, there are no seats left by the time it gets to my station and I end up having to stand all the way to London and closer to town it can get rather tight in the train.
This morning on the station after mine a family got in - a man, woman and a small child in a stroller. The father parked the stroller sideways in the middle of the carriage door area and the mother decided to sit on the floor next to it. And she would not move or get up. As we were getting closer to London more and more people piled in and had to start trying to step over her as she was sitting with her legs stretched in front of her.
I understand standing is a pain for the journey, but come on. You cannot take up the space of five, six people just for your own convenience.