I think there's a bunch of interrelated issues in American culture, many tied to economics.
Parents want to their kids to be successful, and the general theory on this is that you have to do well in school early so that you can get into the right college so you can get the right degree so you can get a good job.
I think this leads to relentless pressure on kids, especially boys, to be "perfect" in school. Deviation from this leads parents to wonder what's wrong, when, in fact, what's wrong may be "he's an 8 year old boy." Parents believe and our culture does everything to reinforce the idea that if you screw up early you won't make it into the right schools, activities, college, etc. There's no room for error, no room to be an 8 year old boy for whom its perfectly normal to have a ton of physical energy and not a lot of focus on sit-still studies.
The educational system, especially in urban areas. There's this relentless focus on "the achievement gap" -- mostly blacks, but often including hispanics, not achieving the same test scores, grades, etc. as other students, mostly whites (although you could include Asians, they often outscore whites).
Fighting the "achievement gap" has led to two things. One, more testing and more focus on elementary education test scores, which has led to more intensive focus on reading and writing, which is challenging for all boys of elementary school age. We've taken something hard for young boys and kind of made it harder for them.
The second thing is that schools have tried to become social welfare delivery mechanisms. It's beyond obvious that the MAIN reason low-income blacks do poorly in schools is the absolute train wreck of urban black culture -- broken families, incarcerated parents, dangerous, crime-ridden neighborhoods. School districts can't solve this but they have devoted a lot of resources to it -- social workers, free meals, all kinds of social benefits to overcome the insurmountable problems when mom is on welfare or underemployed, dad is in jail or unknown, the neighborhood is a war zone, etc.
This well-intentioned but myopic attempt to solve the insoluble has led to schools losing their focus on kids generally, especially boys, as well as causing them to burn a lot of resources that could be better spent on programs that boys find engaging even though they might not contribute to the political issue of low test scores for black kids.
The last thing I'd add in is our culture's relentless, zero-slack atmosphere where everybody has to be plugged in all the time and there's no time for anything but work and more work. I hate it and I think it has a lot to do with why so many people, especially young people, are fucking snapping and going batshit with guns.
Combine it all together and you have parents terrified that their kid, performing poorly in 2nd or 3rd grade, needs to straighten out NOW or he won't go to college and will wind up poor and destitute.
It's a crazy conclusion but I tell you as a parent of an 8 year old who was in that same situation it absolutely flashes through your mind. My son was basically refusing to do assignments in class and when he did do them doing a very slapdash job, yet was scoring so high on standardized test we got a letter from the district that said he was in their "gifted" category! Of course we did everything we could (pediatric ADHD screening is an absolute joke, they don't even white-out that the screening questionnaire is made by the drug company) and went all out for a neuropsychiatric evaluation that basically said "Your son is really high IQ, school bores him and the tasks he does poorly on are really pretty poorly matched to 8 year old boys. He doesn't need ADHD meds." I'm glad we spent the money to basically learn the obvious because from a pediatrician perspective we could have easily been talked into meds, although even on the drug company ADHD screener we were iffy in terms of ADHD.