I'm an old bag who remembers the notices on buses about children paying half fare giving up their seats. So yes she has a few points. On the other hand, hypocrite that I am, I don't like my small(ish) children standing up and holding a pole as the bus careers around corners. But I do make them bunch up and the younger one sit on my knee when it's crowded.
As to supermarket parking, maybe it would be a good idea if supermkts used some of their profits to employ a warden in the car park. It makes me furious to see 'ordinary' (ie non disabled/non small child accompanying) drivers take up either P&C or disabled places. It also makes me furious to see perfectly able bodied folk jumping out of cars with blue badges without any disabled passenger/driver. The writer failed to mention that a significant number of blue badges are stolen/borrowed - in London it's an amazing proportion, and maybe that makes people cynical. A warden could also discourage this. Yet I have only ever seen one ( a Morrisons in the Lake District as it happens).
And maybe we just all feel 'entitled' to have a parking space. My mother had a double push chair that probably didn't fold at all - it was walked to the local shops/school. Again, I am of course being a hypocrite here as I use the car.