Alcohol and bad decisions go hand in hand. Courier Six has learned this first hand and knows how bad those decisions can be. What he wasn't expecting was for things to take the turn they did.
With the commonwealth on the brink of war, the sole survivor finds himself incapable of deciding who to side with. So he distracts himself with anything else he can find. The mechanist, Far harbor, Nuka world, anything to get him away from the central issues within the commonwealth. Now though, he and his companion Dogmeat get stranded in the world of remnant, stuck teaching.