You should always have extra layers of security in your house. As some have already mentioned, a canine friend is usually enough to deter the casual criminal. Even if it doesn't, it should be able to alert you. I have a dog and an alarm system in my house. I do wear headphones when I am on the computer so I don't wake my daughter in the next room. I don't put them loud enough so that it blocks out all sound though.
The ATF should be a convenience store instead of a government agency!