It doesn't make sense, does it? I'm sure there are some "lazy parents" but surely there always have been. The idea that the "lazy parents" have suddenly exploded in number out of nowhere doesn't make sense when there are a load of very clear things in schools which we know have declined slowly over decades and are all at a massively impairing point by now.
Lack of special school places/extremely poor handling of inclusion in mainstream
Teacher retention, teacher stress levels, teacher numbers, classes taught by supply teachers
Teenage mental health, smart phones, social media, post-pandemic effect.
Condition of school buildings, school funding and resources, class sizes etc.
Disruptive behaviour in the classroom
Move away from coursework/projects to more exam-focused teaching. More emphasis on academics for longer, fewer vocational study options
Lack of adequate provision for teen mental health/waiting lists for diagnosis and support through the roof (I've had people argue that this didn't exist in previous decades so the lack of it now shouldn't matter
)
And lastly I think a shift from blaming the child - there was a time that truanting was largely ignored, and nobody would chase children who didn't bother to go to school or get exam certificates. It was just seen as well, they won't get a good job then. I don't think this was right BTW, but shifting from that to blaming the parents, or forcing the kids into school but not actually bothering to support them to do the things they would have opted out of in previous decades - how is that better? Of course it's not. I think at least some percentage of these children would have always existed but they are more visible now.