Well, it depends on why they're taking the medication. You're correct if it's prescribed, but if they're taking it off their own back, it makes sense to suggest they ease off it.
I based my comments on the following observations:
-It's well known that Americans are over medicated.
-It's highly plausible that the Adderall is the cause of the psychosis.
-Physicians in the US are paid a sales bonus for prescribing medication to their patients.
It's really sad that things have progressed to this stage but taking amphetamines every day is not a good idea no matter what way you want to paint it.