As I'd mentioned in an earlier post: by giving into evil behavior, you're going against God and what role He designed for civil government (to punish evil doers and hence promote goodness).
I'll leave you with these wise words which I like to use somewhat frequently in various posts:
All societies of men must be governed in some way or other. The less they may have of stringent State Government, the more they must have of individual self-government. The less they rely on public law or physical force, the more they must rely on private moral restraint. Men, in a word, must necessarily be controlled, either by a power within them, or by a power without them; either by the Word of God, or by the strong arm of man; either by the Bible, or by the bayonet. It may do for other countries and other governments to talk about the State supporting religion. Here, under our own free institutions, it is Religion which must support the State.
Robert Winthrop
to the Annual Meeting of the
Massachusetts Bible Society
Boston, Mass; May 28, 1849
You want to promote evil and hence use government not only in an unrighteous role as drug pusher, but to later use their physical force against those who while high on drugs do things that go against common decency.