In your quote I thought it said something about mentally ill “at time of entry”.
Without a comittment, it would be pretty hard to deport him. All they seem to have diagnosed is depression.
I wish his parents could have seen the signs but I bet he hid it from them.
I’m guessing it would still be easier to deport him for his previous trouble with the law (didn’t he have previous trouble with the law?), than for being mentally ill.
The McCarren act is for aliens who develop mental illness after entering the US. It states that the alien must always meet the criteria required for entry.