What's important is how much and how often someone drinks, not what kind of person they are. Alcoholics do it to themselves. Nobody forces them to drink. They could stop if they wanted to. Again, we can choose how much and how often we drink, but we can't choose how our bodies will react to the alcohol.
Some individuals can drink more than most people and never become alcoholic.
Others, with a higher level of biological risk, can become addicted much more easily, even though they consume less alcohol, less often. On the other hand, the research does reveal that people have different levels of biological risk, or trigger levels, for alcoholism. This means that if you drink enough alcohol often enough to reach your trigger level, you run the risk of developing alcoholism.