I think this is the right spirit, yet inconsistent with humanity. People are silly. They won't always (or even most of the time) do the rational thing for themselves, even when they know what it is. Some people start using drugs to fill a void, while others do it simply because they met the wrong person, or they wanted to see what it was like, or they wanted to impress their peer group, or any other silly reason. For examples of this, look no further than the rampant use of drugs in the entertainment industry. These actresses and rock stars can afford anything they want in life (especially counseling), yet so many still chase highs.