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"...many more—more than a quarter each year—will have some diagnosable mental disorder..."

This is an easy one. The people who are creating these standards have a vested interest in increasing the population of people who might require treatment.

Secondarily, this also opens up large swaths of the entitlement population to government largesse.

Basically, more people with disabling mental conditions who can get disability or other benefits.

Note that I am not saying there should not be people who are eligible for some kind of help if they have a mental condition that really needs it. I am saying this is an intentional broadening of the definition of who needs it.