who said they need to keep high-powered, semi/automatic guns for defending themselves? didn't you say you're fine with them using it for hunting or target practicing?
Most people who carry concealed weapons DO NOT usually own high-powered, automatic guns because that is impractical to carry. It's heavy and bulky. They mostly carry fairly small pistols. And do you have any idea how expensive high-powered guns are??? and the bullets for that too! Mind you - automatic weapons are illegal and have always been illegal.
If you can - can you please tell me if you have heard in news where people shot intruders in self-defense with high-powered, semi/automatic weapon?