ADHD is caused by a defective gene involving the DAT1 transporter causing it to be overactive. This causes a deficit of dopamine that predominantly impacts the right dorsolateral prefrontal cortex (there are other parts impacted too, but this one is the most apparent). The brain compromises with novelty seeking behavior to rebalance the neurochemistry as a depression response, and this outwardly manifests as distractibility.

Don’t talk of things you have no clue about. Saying ADHD is “manufactured” is downright harmful. And yes, stimulants do treat it, and do so very effectively. I encourage you to learn more about it from Dr. Russell Barkley, the leading authority on the subject. He does well to dismantle the myths and stipulations and is very knowledgeable. He even has a youtube channel where he elaborately breaks down the studies in a way the common man can understand.

One can be largely satisfied with their situation but still be lonely or just not particularly happy & fulfilled. Higher satisfaction with one's income can mean more loneliness because of work hours etc.

The number of births per woman has been declining for decades worldwide, in cases like South Korea it's collapsing massively. That has many reasons, but it's obviously linked to loneliness and relationships.

> This is a manufactured crisis like seed oils, or ADHD and autism diagnoses

More ADHD and autism diagnoses aren't a crisis, they're an improvement in detection and diagnosis and overall life quality of the affected people.