Horrendous, and agree, although the girl being pushed onto the tracks is extreme and not common, the violence and intimidation shown is.
I work in a school, I have seen several incidents where a gang of boys (usually led by one or 2 serious troublemakers) intimidate a girl or a weaker boy. Its not necessarily a male against female problem but its definitely a male violence problem.
Who is bringing up these thugs? Parents who are poorly equipped to cope with challenging their difficult children (and lots of children are difficult), it often is people who (through a mixture of issues) end up as single mothers and/or with feckless partners/husbands who are thuggish themselves, the boys become like their dads.
Schools are powerless most of the time and the parents complain that their child "gets blamed for everything" meanwhile staff get called "fucking cunts" by these boys, who just get told to not do it again. Their parents get called in, who claim they are lovely at home, but as the boys get older, are often scared of them.
If they persist on this path, they will end up in jail, because they get off with it as teenagers but not as adults. Its insidious, and as someone who works with children that have the potential to end up like these thugs, very depressing.
Its a societal problem, footballers and other sportsmen are applauded but can often show serious aggression and these are the people these boys look up to. Too much aggression is tolerated on the pitch, shoving etc, our boys think its ok. If you do that in the street as an adult you'll be going to jail.