Kind of pathetic compared to how it's done in Iraq. When the bad guys decide they want you, they send 20 or 30 well armed thugs to your house. They go through doors, windows, walls, wherever they can find a way. If the homeowner is lucky, he may take 5 or 6 of them out before he either runs out of ammo or is otherwise subdued. Usually the intent is to grab a family member for ransom or extortion or compulsion. If they can't get what they came for, they may just go ahead and incinerate or blast the home to Allah.
I like the idea of keeping my firearm with me throughout the house, and next to me when I sleep at night. I also like the idea of building various, um, defensive aids into the home. The best defense is still a good offense. I like the sort of things that send the bad guys running screaming into the night. Alas the liabilities give cause to abstain from deploying the more nastier concepts.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)