Some people like to use hand sanitizer, while others do not. Sure, we could ask "what's the worst that could happen if you don't sterilize your hands before eating that turkey leg?" and "surely they have more important things to worry about..." But the thing about personal safety is that it's, well, personal. What's wrong with someone's safety precautions that are more cautious than yours?
We all know that there are creepers out there. Yes, there are ways to identify a person using the internet, public records, etc. But why should any of us be forced to make access to our information (even if it's just our name) easier than it needs to be?
If I see a person exit their car, and something about that person strikes my fancy, I could walk over, get their printed name information (if they left the tag in view), and now be able to research their information in our modern day and age of social networking. I can immediately "cyber-stalk" that person without going through the added hassle of formal searches through county offices, where I might fear that a record will then exist of the fact that I even conducted a search of their information in the first place.
A lot of us strike up conversations with other guests in the WDW parks, but unless the conversation is particularly meaningful or we intend to stay in touch, we typically introduce ourselves as "Steve," not "Steve McQueen." A full name is not something that we typically throw out there to a stranger in passing.
If a woman is at a bar and approached by a creeper, it's her choice whether to respond to him, and whether to give him a first name, or full name, etc. But we don't criticize her right to ignore the creeper altogether.
If we're indeed a full-name culture when it comes to casual interaction with strangers (which we're not), then why not put CMs full names on their name tags? With a company that has many employees with the same first name, wouldn't it be easier for guests to identify CMs (for good or bad reasons) if their full name was printed on the name tag? Of course. But is that the case today? Of course not.
Maybe there is an extremely low occurrence of theft from cars parked at WDW. Does that mean we should should make it easier for the rare (if any) opporutnistic thief and leave our car doors unlocked, with the justification being that (1) it's extremely unlikely that anything bad will happen, and (2) if a thief wanted to simply smash the window then they could? Of course not. That would be silly. We lock our doors.
If a guest does not want to have personal identifying information on their car (which could even be a rental), we should not dismiss or ridicule their concern. :brick: If they want to exercise an extra layer of safety in anonymity, that ought to be perfectly acceptable.