That's BS. The Libertarian Party is THE party of personal responsibility and PERSONAL morality.
Which is more immoral: 1) to support everyone's freedom to put into their own bodies whatever drugs they want--or need, as in the case of medical marijuana--while absolutely opposing government support of any kind for addicts, or 2) supporting the federal government's completely unconstitutional laws against drugs, including trampling both States' rights and human decency to prohibit using marijuana for medical purposes?
Libertarians argue (correctly!) that #2 is far MORE immoral. Many, if not most, conservatives support the federal government breaking The Law (the Constitution) by continuing the War on Some Drugs...even to the point of hurting or killing sick people (people who need medical marijuana).
It's Republicans and conservatives that lack the moral compass: the moral compass that our founders had in abundance, and that Libertarians have today.