I think this is an angle that needs to be made much more public. Not only are people denied access to an extremely popular platform just because they are (for various reasons, some important, some probably less so) unwilling and/or unable to use their real name, but Facebook essentially also polices who the rest of the Facebook users can talk to on its platform.

If they would be seriously concerned about their "Safe environment with real names" stance they could simply offer an option to people to get their account verified and flag those accounts with a visible RealPerson (tm) badge and allow people to restrict their view of Facebook to RealPersons (tm). People who want to feel safe from "Unreal people" could do so with more conviction than they do now and the rest of us could happily get on with life.

As it stands they just invite bullying and randomly punish people who are honest enough to use unusual names instead of hiding in plain sight with a real sounding, yet fake name simply to be able to continue presenting to their costumers (i.e. not their users) a reassuring illusion of the "realness" of their user base.