I don't disagree with your statistics, I disagree about some of the conclusions you draw from them however.
I do not believe it is because the homicide to burglary rate is the reason for this difference in thinking. Sure, I recognize that even in the U.S., a burglar breaking into my house is probably more interested in my things than me. I'm just not willing to bet my life that a case I may run into falls into the majority, and I don't think that anyone should be asked to bet their life on it.
The reason that these laws are necessary is because without these laws, self-defense shootings, or even cases where a gun is used in self defense but no one was killed (the offender was scared off by the sight of the gun, or perhaps the shot missed but the burglar got away), enter a very legal gray area. A situation can very easily arise where a person in 1 county who shoots someone in self defense won't even be arrested, but someone who lives 10 miles away in a different county who reacts the same way to the exact same situation will be arrested, charged, and subjected to a lengthy trial where the caliber of his lawyer and the whim of the jury may cost him hundreds of thousands of dollars and his job, which is not required to wait on him as he goes to trial.
The outcome that person faces depends largely on local forces, which officer happened to respond, which local DA happened to look at the case. The politics and attitudes of these individuals makes a big difference in what an individual has to go through.
By having these laws, these people have an immunity to such prosecutions. A person shouldn't have to think "Well, he's got a gun pointed at me and he looks like he's about to shoot, but I hope he doesn't flinch when I pull the trigger, because if he turns his back to me while I'm shooting him, it'll hit him in the back and I could be accused of murdering a fleeing intruder." Yes, this has happened prior to these laws. CSI is just a TV show, in the real world a lot of conclusions like these are drawn from limited evidence.
Even in cases where no one was shot, brandishing charges and attempted manslaughter charges could occur.
So I guess you can say that, because of flaws in our criminal justice system, these laws are there to protect the innocent homeowner, and yes, it's quite possible non-violent burglars are at greater risk of getting shot. But, I would argue that 1) no system is perfect, and 2) when a person is in real fear for their life, the presence or absence of a castle doctrine law is not going to be the deciding factor in whether they shoot back. Other experiences and personality traits in their life influence whether they are able to take a life in self defense far more than whether or not they are aware of a castle doctrine law.