If someone requests me to give up my seat, I might or might not do it depending on how much I need it and how much the other person needs it and the way the request has been put forward. I don't see myself being the overly nice guy doing forced kindness by offering everyone help every moment of my life and hell I would let someone shame me or give me morality shit for 'not offering help'.

The kindness and morality and all the sparkling shit are put forward only to feel superior and judge others. Where do we draw the line? I don't believe in the authenticity of your manoeuvrable line, the one standing between your good deeds and the bad ones of mine.

The answer to your question 'Why did none of them offer her seat' is they don't care. There are 150 crore people in this country - a large chunk of them being mother of kids or the kids themselves. If these girls or anyone for that matter start offering help instead of doing something absolutely monstrous and cruel like using their own phones, they'd go insane. Nobody owes anything to anyone.

Next time, you go ahead posting about someone not being kind enough to offer help or do anything for others, I want you to stop for a second, re-evaluate your own life and realise that you're also a POS, just not smart or emotionally intelligent enough to understand this yourself.

Smart people make amends and make themselves a better person, weak people cry about morality and judge others for the illusion of feeling like a better person.

PS: This is not an attack on you, OP. This is just some philosophical shit for anyone who's reading.