The most conservative estimates of DGU, according to bloomberg, are on the order of 100,000 a year, from the NCVS. http://www.bloomberg.com/bw/articles/2012-12-27/how-often-do-we-use-guns-in-self-defense
And those home invasion numbers weren't over 4 years, that is a per year average.
in only 12% of cases was a firearm used by an assailant, or about 30,000.
There is a need to be able to effectively defend yourself even if the assailant is unarmed or armed with a knife or blunt object. And remember, that is a per year stat, so compare that to per year gun homicides of around 8000 in recent years according to the FBI.
All of this shows that a good deadbolt and locked windows, as well as a baseball bat or mace or even a kitchen knife, is just as effective and much safer to keep around the home.
You are drawing conclusions that haven't been studied. We don't know if those things are just as effective as a firearm. They are certainly options though, no one is forcing anyone to own a gun.
Yet the NRA has people like you brainwashed into thinking that you need to keep a deadly weapon to defend your meager possessions because of an imaginary bogey man.
It isn't to protect my possessions, I couldn't care less. If someone wants my stuff they can have it, it is insured. If they want to hurt me or my family, then that isnt ok, and it happens. A woman was raped in her apartment at knife point just a few blocks down from me by a home invader. She was awake when he broke in, but couldn't do anything to defend herself because she didn't have a gun. My girlfriend knows where the rapid open pistol safe is, and it has a loaded gun inside.
The other thing people like you tend to ignore is that the risk of keeping a gun in the home would be present whether or not I want to be able to use it for self defense. Guns are my hobby, a sport that I choose to engage in. I store my firearms safely. Once the gun is already in the home, the risk is present, there is no significant additional risk from being prepared to use it in self defense if necessary. Just about every country allows firearm ownership for sport, so that isnt an unreasonable purpose for a legally owned firearm.