Well this is a preventive recall. Fortunately you need not really worry unless your headliner or visor have been worked on, and that's not a common problem type.
Don't know about preventative. Says there were 3 incidents leading to injury. But as far as the cause, yes it appears that it's because of a bad service bulletin being followed in response to a common consumer complaint, leading to bad repairs. As far as the #s, I have to think that number is the amount of vehicles that have had the mirrors, lights, etc. worked on given the nature of the recall. My guess is that Chrysler went into the service records and found how many have had headliner, vanity mirror, and/or light service performed by following (or possibly following) that service bulletin and came up with that number for the recall.