It's only fair to warn potential intruders about what they face if they decide to make the very bad decision of breaking into your home. Some people put fake signs in their yard to make it appear that they have a security system in their home. But why display a fake sign when you can have an accurate one like this?
I don't know about you, but if I was a criminal, this sign would scare me way more than some generic security sign. Facing an armed redneck is a lot scarier than a loud alarm going off.