Maybe they actually were ADHD due to childhood lead exposure. ADHD treatments don't have many downsides (although I'm sure people thought they did at the time) except for reducing your appetite and doctor's bills, so it's not like it caused long term harm.
Aren't the medications amphetamines though? Certainly the backlash against over-diagnosis of ADHD in the '00s was fear of kids given drugs during their formative years for "being rambunctious." Very adults it's likely different though.
Not all the medications are amphetamines. The most popular medication, Ritalin, is not an amphetamine.
Even the ADHD prescribed amphetamine medication is dextroamphetamine, not the scary methamphetamine.
There are also several medications that are not stimulants. While I do believe that children should be prescribed the minimum medications during their formative years, I've talked to several teachers whose students now have a prescription because the children were doing school at home and finally followed the teacher's recommendation.