I personally feel that we should be able to shoot someone who is breaking into your car without the fear of prosecution. I mean, if thieves know that they can be killed for breaking into a car, they would probably reconsider.
Make punishment for crimes more severe and I believe crime rates would go down.
So your basically saying that your willing to kill someone because they are breaking into your car... your willing to put yourself in harms way by confronting someone that, yes, is committing a crime however is not at the current moment about to cause you serious bodily harm or death? God I hope your never put in that situation.
Remember, to make it justified you have to know they had the "opportunity, the ability, and the intent" to do YOU or an innocent victim great bodily harm or cause YOU or a innocent victim death. Being the hero to save a broken window doesn't fit that description at all.