The USA has 51 separate criminal justice systems. It's not possible to consider it a single 'jurisdiction' in criminal matters.
Are you a lawyer? Odd how you can give such convincing legal advice, without knowing the specifics of a situation. So, any intruder can break into any home in the USA, be shot dead in cold blood by the homeowner, and get off scott-free? Interesting country you live in.
Please provide a reference to an actual court judgment (or even a news story) where an intruder broke into a home, made no threat or other sign of harm toward the homeowner, was killed by the homeowner, and where the homeowner was acquitted. I think you'll have a hard time finding one. If the intruder was a visible threat to the homeowner or a family member, then I can understand self-defence being used as a defence to a murder charge. If no threat is made, and the intruder would have left as soon as he was discovered, then it's hard to legally justify killing that person.
Some might say the same thing about the 'system' in the USA.