It is also obvious that legalizing in a HUGE area will scatter harms, but never fear, with legal drugs, there is so much harm to go around that it will expand to fit the need every time.
They're not referring to Needle Park, which Switzerland quickly abandoned; it's obvious that legalizing in a single small area will concentrate sale and use in that small area, with all the predictable harms.
It is also obvious that legalizing in a HUGE area will scatter harms, but never fear, with legal drugs, there is so much harm to go around that it will expand to fit the need every time.