Seriously? I don't blame him. I'd do the same if I were him. I know some people who have had things tagged to their FB that they had no part in.
I actively check my security settings and posts on a daily basis. I'd even require responses to be approved before posting if I could, but I haven't seen that feature on FB.
Good for DKB. Bad for DA who's probably upset because he can't spam his HMH website on DKB's wall anymore.