I agree with this. For one thing statistics on violent home invasions are spotty. If you're going to use this phenomenon as a major factor in justifying use of firearms for "self defense" then it would be a good idea to know how prevalent the problem is. The issue is that statistically the crimes are sorted out into separate categories. A violent home invasion resulting in robbery, rape and murder is recorded to be as many as six separate crimes - unlawfully in dwelling, murder, robbery, aggravated assault, forcible confinement and sexual assault. There is no separate category for a violent crime committed following the entry to a dwelling through force or subterfuge, and I think that statistic is the one most needed.
What seems clear is that most break and enter/burglary type crimes do not involve violence. I'd say that because the
total rate of violent crime is only a little over half the rate of all burglaries, all violent crime (including homicide, forcible rape, aggravated assault and robbery) being at a rate of 386 per 100,000 while just burglary on its own is listed by the FBI at a rate of 702 per 100,000.
An important thing to remember is that most criminals don't become criminals because they are ruthless, deviant and intelligent. They become criminals because it's easy. Which is why if you want to make your house secure the first step you should take is to make it slightly more difficult to break into than your neighbour's house. If your house has new windows and better lighting and your neighbour's house has a rickety looking door they'll try the neighbour's house unless there is a particular reason to find your house attractive. And usually the reason your house is more attractive is because you are known by the criminals to have drugs or cash inside.
This doesn't count the fact that there are some criminals who plan crimes against individual homes in order to steal, say, cars or jewellery. But those criminals are statistical outliers. Almost all burglaries are through the front door which is kicked open and any valuables that are easy to carry are taken away.