Some reasons might be:-
Liberal parenting where actions are not followed by consequences and where manners and doing what one is told are not taught or followed through. Also, the child is taught she is the centre of the universe.
Useless left wing state propaganda instead of a traditional curriculum in schools taught with traditional methods.
Social media whereby smartphone technology allows outside influences from advertisers to friends to bypass parental authority.
The ubiquitousness of porn even in primary school.
Non stop testing of children and pointless targets in school. Bench marking is OK but you cannot get an A grade from someone who does not have the natural ability to achieve one.
Computer gaming, especially harmful to boys.
Parents who support the child against the school, not the school to the child.
An inability for the child to run around freely outside the house and learn things for themselves.
Children doing anything else but reading books.
There are so many difference s between life ‘then and now’ that it seems like a different world for children from the largely happy and feee place I grew up in.