The trouble is, people interpret "real name" as "legal name, as shown on your real world photo ID". And then insist on putting that on the front of the badge, along with the "badge name". Now, I have no problem with putting the legal name on the *back* of the badge and insisting that the front of the badge include a name you are commonly known by in fandom, but I'm not happy with the insistence on publicly associating both names. A badge with a membership number prominently displayed is enough to identify someone who's being enough of a problem that it's necessary to find out what their legal name is.