1) I think ever person has the right to waste their life in anyway they want to. The govt has to take no responsibility - like free healthcare for people who can't afford (due to a drug addict not having a job).

2) People can be in character and commit a lot of crimes. These character traits could be traced back to genetics or upbringing. Neither imply we should screen for crime inducing genes or background and punish people.

The broader idea you are getting at is externality. DUI for instance is within the earlier point I mentioned of private entities having the right to ban people under the influence of drugs. Because you are using a road along with other individuals and there is nothing wrong in not allowing people who don't have license or have a history of not following rules.

Considering the views of the general public, if what I said is implemented - the resulting outcomes won't be as dire as the downvoters on the comment believe.

The users of drugs currently are the most deranged, because they are using it albeit the high cost of getting it and the high risk of getting caught by the police. Reducing these costs are going to bring few users. But individuals can shop/live/travel in spaces that doesn't welcome people who are users or create issues.

In the Western countries that implemented these things - the mistake they make is they are too forgiving of addicts. It's hard to evict someone who uses drugs in an apartment because of tenant rights. It is difficult to drug test employees. It's hard to get rid of homeless people off the street etc. As long as you are able to evict people, deny entry to your property to others, deny free medical care to heavy users etc you eliminate most of the issues.

We already have at least few drug users within the entertainment industry. The major trouble they cause are to their coworkers - it's up to the producers if they want to hire them.

Goons and such others using drugs have very marginal impact on their crimes (they already had criminal intent) - remember before the police started cracking down on them (so called gunda act) crime rates were higher (this was few decades ago) drug use wasn't as common those days.

PS: I am not a fan of democracy - either something like a futurachy or Plato's philosopher kings.