There would be more jobs in the mental health field, that's about it. For paying about $8,000 a year plus medical for disability, they aren't worthy of life you are saying. For that, the doctor doing the slow kill would want $8,000 a year per patient, plus nurse, receptionist, etc. Humane would actually be what they do now, psychiatry.
So you basically pay a bunch of professionals 50-250k a year to torture the poor sucker instead of just leaving them be for 8k a year?
Like couldn't these educated people find something better to do with themselves and make themselves more useful? BTW, the drugs cost millions per few thousand patients.