And there is simply NO "right" to be an addict. No right to be a burden upon society and social services. It was expected that people have character, integrity, and act ethically. We`ve lost that in the culture today, and the more lawless and deviate the populous are, the more laws are required in order to KEEP order.
"Our Constitution was made only for a religious and moral people. It is wholly inadequate for the government of any other." John Adams
To your first point: Laws against addiction are as useless as laws against cancer, addiction is baked into some people.
To your second: society chose to allow them to become their burden.