I actually think there is kind of a conspiracy around alcohol. Because the effect of alcohol is to reduce your cognitive function, and that often causes normal people to become drunk since they have an impaired decision making ability about stopping. Drunk people sometimes make mistakes that interfere with their lives.
But if you become drunk and make mistakes multiple times, which I assert is actually a completely normal consequence of regular drinking for everyone, then people will literally say that it was not the alcohol that caused the problem, but that you have defective genetics (are an alcoholic) if you decide to stop drinking.
So I think they idea of alcoholism as a genetic disease is actually a really effective propaganda by the alcohol industry. No one can really safely consume significant amounts of alcohol regularly without making mistakes. Some people are more susceptible, but that doesn't mean that they are genetically flawed or that other people can't easily run into problems also.