You're right on point . Dr. Ben seems to be out to lunch as they say about growing small amounts of pot. His assertions about quality and danger to others make no sense at all. In fact it would go against every jurisdiction in the United States who has legalized pot where up to 6 plants can be grown for personal use. Home grown pot would probably be safer than commercial pot where various chemicals would have to be used in a mono cultured growing greenhouse situation.  You are correct the Dr. misses the  whole point of legalization. Pot would continue to be grown and sold on the street just as it is now. This article seems more humorous than factual and therefore more of an opinion and you what they say about opinions.