ORIGINAL: Sport_Pilot
All states allow lethal force under certain circumstances. Most do not allow you to kill if say they are stealing from you or destroying property. Some do. But even in Texas the trespasser must be at least appearing to be stealing or destroying property.
According to Comcast (and many others) theft of service is stealing and a criminal offense. So trespassing to use your property for a purpose that others are paying for is stealing. We are not talking about people taking a shortcut through your yard. Yes, you can protect your property from such criminal activity.