When your blog is part of your in real life public presence, you obviously don't want to do that. And I started blogging before many of today's concerns became as big a deal. But, if I were starting a blog today that was divorced from my professional identity, I'd seriously consider not connecting it to real life me--especially if I regularly blogged about political issues (which I don't).

There's a long history of people writing under pseudonyms. If someone really cares they might be able to connect the dots (and many times so if they're a government) but that's not the attack scenario for most people.