Sec. 7-3. Use of force in defense of other property
(a) A person is justified in the use of force against another when and to the extent that he reasonably believes that such conduct is necessary to prevent or terminate such other's trespass on or other tortious or criminal interference with either real property (other than a dwelling) or personal property, lawfully in his possession or in the possession of another who is a member of his immediate family or household or of a person whose property he has a legal duty to protect. However, he is justified in the use of force which is intended or likely to cause death or great bodily harm only if he reasonably believes that such force is necessary to prevent the commission of a forcible felony.
Letter of the law and interpretation of the law by courts disagrees, and say deadly force is not acceptable in these circumstances. In effect, the courts have changed the law. Let the criminal have your 4k tv or car. People don't equate a human life with a piece of personal property. I tell my students to only use deadly force to avoid imminent and otherwise UNAVOIDABLE danger, death or great bodily harm to yourself or someone else. Just be a good witness.