Doesnt have to be a warning...can just be a simple fact...."hey Mr. bad guy i know youre busy and all trying to bust down my door so you can rob us and probably kill us but i just wanted to let you know that as soon as you break through my door you will be able to turn around and see your brain matter all over the place."

I know its problably not this simple but the way i look at it is i rather be them than me or even worse my family. Would it suck to have killed someone....ya no doubt it would...but how bad would it suck that your family got raped and killed and you could have stopped it but you dint.......now you dont have a family and your tax money feeds and supplys a roof over this guys head....Ill take the shots.

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Aim small miss small