I'm not saying it's politically practical, just identifying the problem.

) this very closely because your argument is immoral. You are using a generalisation to "justify" hurting people. We don't say murder is immoral because we pay for it one way or another. It is immoral because there is a victim and a perpetrator and that perpetrator committed an immoral act, not the guy down the street who smokes pot. We don't say he is immoral because someone else committed murder. But that is the essence of your argument, you say I should be punished for using or selling a drug because somebody else did something bad to another person. 
) this very closely because your argument is immoral.
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