What does it mean to be a defensive driver? Is it that: "I'm a good driver and everyone else is a poopy head?"
Know that other drivers are going to cut you off, other drivers aren't going to signal, and that pedestrians are going to step out in front of you.
Unpredictable actions are, in fact, predictable.
Defensive driving is developing habits and driving techniques that will keep you safe when other road users make mistakes and when YOU...yes you, make mistakes.