1)Economic costs
2)Constitutional costs
3)Illogical considering several legal drugs are far more harmful than some illegal ones
4)Expanding the federal governments powers
5)True belief in liberty.
I mentioned several things however that were not drug related. NEA, Foreign Aid, IRS. I'll add some more. Welfare, SS, medicare.
LOL! That one was funny. Every political party has a soapbox or two. For Libertarians, it is drugs. I like a lot of libertarian principles, but cannot get over their stance on drugs and intolerance for the Religious Right in America. That being said, I still respect my few Libertarian friends.