Why limit focus to shootings, simply dissuading the intruder is far preferable and probably much more frequent. In my experience most gun owners don't want to shoot anybody.
If, as you suggest, it's much more frequent for a homeowner with a gun to dissuade an intruder without shooting, than it is for the homeowner to shoot the intruder, then it's obviously a much better choice to keep a convincing replica. In that case, you get most of the benefit of a real gun, but there's no chance of your kids injuring/killing someone, or you accidentally injuring/killing a family member, both of which are about as common as shooting an intruder.
Or: If your point is to avoid accidents and not to disarm people you can recommend they get a gun safe.
Around here gun safes are mandatory. And local hunters and sports shooters work together with the police to keep guns out of the hands of people who cannot be trusted.
Guns kept in proper gun safes are pretty much useless against intruders though.
(To be clear, I agree everyone should keep their guns properly stored in gun safes at all times, and I also think guns for self defence are a bad solution in first world countries.)
