You have a poor understanding of how helpful amphetamine products can be for people, when the right ones are used under doctor's supervision.  My life turned around completely once I started taking Adderall.  The few times that pharmacies have been unable to immediately fill a prescription for me, my life returns to the hell hole it was before.  While I can't know whether they were using them under doctor's supervision, amphetamine products are very useful in general for increasing your attention span and helping you stay focused.  Certainly they can also be abused, and are not allowed to be prescribed in some countries because of that potential, but I wouldn't hold it against people who claim that amphetamines have been a great help to them.