There's only one reason why a character drinks: to seek confrontation. To fight for what they want in ways normally denied them.
Michael ShurtleffCompetition is healthy. Competition is life. Yet most actors refuse to acknowledge this. They don't want to compete. They want to get along. And they are therefore not first-rate actors. The good actor is the one who competes, willingly, who enjoys competing. An actor must compete, or die...Peacefulness and the avoidance of trouble won't help in his acting. It is just the opposite he must seek.
Michael ShurtleffAn actor is looking for conflict. Conflict is what creates drama. We are taught to avoid trouble [so] actors don't realize they must go looking for it. Plays are written about...the extraordinary, the unusual, the climaxes. The more conflict actors find, the more interesting the performance.
Michael Shurtleff