Principals are not set in stone. Rather, they are constantly evolving from one generation to another; a law one day-- maybe obsolete another. Take, marijuana for example, as this drug has potential to be the greatest-medicine-- in the history of mankind-- yet, it's still illegal in most states. The prescriptions' that make one lazy, are the one's that should be banned-- anti-depressant, dopamine-blockers, and weight-gainers.
Individuals that take these legal-drugs in high-doses-- can be a danger, to society' as well. There are alot of erratic-drivers on the roads, that are breaking traffic-laws' every chance they can get. Guarantee, they are on some legal-medication' and are endangering public-safety.