How Much Training Do You REALLY Need for Lawful Self-Defense?

I recently came across video of a violent interaction between a uniformed police officer making a traffic stop and the driver of the stopped vehicle. The encounter went poorly for the officer. Of particular note was the remarkably high level of both gun handling and aggression on the part of the stopped driver, who aggressively engaged the officer with gun fire and even pursued the officer while continuing to fire. This event raises the important question of just how much training a normal ...