A loan officer at a bank doesn't operate under a fake name because they think some nutjob will assault them when they turn them down for a loan, is it a real threat, however small? probably, but they don't let it run their life.
Yes, but you also don't have members of organized crime syndicates walking into a bank in full view of security cameras trying to actively defraud said bank. It's a whole different ball of wax when the can anonymously get your name and start extrapolating all your personal information to commit fraud somehwere overseas where domestic governments can't go after them. Nor do pyshcopaths apply for loans when they're interested in stalking, harrassing, and possibly murdering people which a real name on a forum can give them the inside track on.
With one Bnet merger Blizzard exposed millions of people to phishers. How much easier is their job going to be when they can start building on peoples real names? This is a criminal's wet dream.
And ultimately, it's like Riker said, this is a huge middle finger from Blizzard to everyone. Don't like it? Don't post or buy our games is what they're saying. Even trolls aside how can they ever expect anyone to give them feedback, constuctive criticism or any other kind of information with something like this when people won't want to expose themselves? Honestly, it's one of the worst ideas I've ever heard for anything. It also smacks of the dickishness of Kotick no matter what anyone says, because I can't believe that Blizzard is retarded enough to think this is actually a good idea.
"Some motherfuckers are always trying to ice skate up hill." - Blade