San Francisco 49ers defensive coordinator Vic Fangio tends to resist lazy narratives even when they're self-serving.It's one of the attributes that can make Fangio a good resource for how well the 49ers' defense is playing at a given time.2011-2012 San Francisco 49ers DefenseBefore the 2012 season, Fangio was honest about some of the factors beyond his control that contributed to the 49ers' stellar defensive statistics in 2011. He credited the 49ers' offense for avoiding turnovers.