It's like the caricature roles in a football team. Offense is optimists, they run to good shooting positions in case the ball comes there. Most of their runnin

It's like the caricature roles in a football team. Offense is optimists, they run to good shooting positions in case the ball comes there. Most of their running is in vain, yet they have to do it every time. They get praise if they make a goal, and if the opponent scores, it doesn't make a difference to them personally or affect their career. Defense is pessimists, they try to prevent the opponent from scoring. They for example have to sometimes commit a tactical fault in order to prevent the opponent from getting to a dangerous position where they could score a goal. They have to guard opponent offense players, even if the ball never comes near. They are criticized if the opponent makes a goal and they don't get credit for their team's offense scoring goals. So, one thinks a good thing might happen and tries to seize the opportunity. The other one thinks a bad thing might happen and tries to make sure it is prevented. Both are estimating an uncertain future and a lot of their work goes to waste - but only in hindsight. Both are needed for a team to win the championships.