I've said this before, but nobody responded. The chances are if someone is going to rob your house, there's going to be more than one of them. That big TV isn't going to go easily. Say you hear them and you shoot one, the other one, assuming he is armed, will shoot you and run away. Your TV still lives in your house, but you don't anymore.
Since the vast majority of people here seem to think they are some sort of rootin' tootin' demon with a gun that couldn't possibly make a mistake. I'm going to tell you a personal story.
I am willing to bet that with the exception of those in the army, I have used a gun more than any of you. I went to military school, and am like Forrest Gump at dismantling and reassembling this:
And was forever in the shooting range.
When I got a bit older, the time came to teach the younger kids how to use the gun properly. When you take one apart, there's often a bullet lodged somewhere it shouldn't be, so you have to inspect it. 90% of the time, there isn't one. 9.9% of the time there is and you can clearly see it. 0.1% of the time, it's in an odd place, so the last point of the inspection is to fire the gun in a safe direction. It was so uncommon for the bullet to be hidden in this way that nobody ever used to bother to tell the kids to do this, and just said if they were confident it wasn't loaded they could pull the trigger to reset the mechanism. This one time, I did it properly, there was a bullet in a little girls' gun that safely went out of the way. Had I not done my job properly, which most people usually didn't, there's a good chance she'd have killed somebody.
What the lesson here is, is clearly you should always be safe and thorough with things like this, but most people aren't, because they are complacent with the familiarity. If I gave someone British who wasn't me an assault rifle, they'd be careful as fuck. I probably wouldn't be so much, I'm desensitised to it. If you make guns a part of everyday life, you remove the enormity of what they really are. That means using one safely is less likely to happen. How many times do you think you'd run the safety checks if you were flying a space shuttle? Compare that to how many times you check the oil in your car. It also, of course, means you resort to using them more readily.
The other lesson I can give you from my life in Full Metal Jacket Jr. is this. Guns are mass produced quite cheaply and still largely rely on very mechanical movements to work. That means they malfunction, quite regularly.
When the hamburgler comes in for your TV, armed but with no pre-meditated idea of killing anybody, you jump out at him and shoot him. Click. Gun's jammed. RIP.
This romantic idea of protecting yourself and yours with a gun? It's great, but the reality will be removed from that, almost always. There'll be two perpetrators, you'll miss, it'll actually be a surprise barbershop quartet your wife ordered. Who knows?