Having worked in software development for several years, it has become apparent to me that the majority of users are not like you and me. I agree, I prefer a blank slate to a wizard. However, Joe-user wants the "obvious" defaults to be set so he can one-click it. Assuming that Symantec has to keep up with the market demand for this "dumb" default installation, imagine the lawsuits if another Columbine can be blamed on Johnny not being automagically blocked from a "pro-violence" (read: pro-2nd Amendment) site.
I'm sorry, but if I were Symantec, I'd do exactly what they've done (my constitutional views not withstanding), and explain it to you exactly as they did.