Answer: Because in this country there are a multitude of groups which legitimately thrive on what the crime/drug complex provides for them. This includes lawyers, judges, police and jailers, to name just a few. That's what it is really all about - socialistic profiteering; not wholly, but to a very high degree! All the while our drug/crime problems worsen.
Most of what makes for more crime and more drugs to reduce the life quality of average Americans, are the federal laws and policies that fly-in-the-face of proven successes in other countries. This is an absurdity we must all look at squarely!
I have an answer to this sociological dilemma, by way of a suggested proposal I think all civic-minded persons should consider adapting to in some variance of form.
Let us suppose that a mayor and city council would sue the U.S. Congress for the dispensational right, and financing for, a single citywide trial of social drug maintenance for all the crime prone addicts within the city of, say Hagerstown. This would include an objective drug treatment option as well. Let us say such an experimental program would have an agreed duration of two years so figures could be compared and evaluated. And, please, let no one put methadone into this mix, since that program only serves a person who is strong and resolute on ending his/her habit of drug use.