If I want to treat my (illegal war) PTSD, depression or anxiety with novel treatments like 2CB, LSD, or MDMA, that is my choice. It immoral to restrict my supply with the barrel of a gun.
That's exactly what makes them the most vulnerable. They are, in extreme conditions, desperate for a medicine and they'll lose sense because of that.
The fallacy that patients cannot act rationally in the face of adversity is a common excuse for compulsory regulatory bodies. While there is value in having a centralized body like the FDA provide consumers with qualified advice on drugs and food, a certification authority can provide that information for individuals to use at their own prerogative.
If you want that policy to change, it'll have to happen at the voting booth, not because some FDA bureaucrat decided it.