Ever consider that what you see as overall deterioration may be the result of the behavior you're trying to squelch being illegal in the first place?
Then please explain the consistency within the similar lifestyles that FOLLOWS hard drug usage.
C'mon, what a lay-up. For the same reason "good" people act in ways that make a community better, "bad" people act in ways that make a community worse. A person with a bad-ass personality is attracted to the drug lifestyle for the same reason a person with a spiritual side is attracted to church. In fact, I daresay decriminalizing certain drugs would go a long way towards making doing those drugs less stereotypically antisocial, and hence less attractive to evil people.
Explain Time Square in NYC then. Most of what was changed there was legal activity, such as porn shops. Why has crime so GREATLY decreased?
For the same reason "good" people act in ways that make a community better, "bad" people act in ways that make a community worse.
I've seen too many good people take a hard drug for some stupid reason, and turn into bad people who would have remained good, if they had never touched the drug.