Check your facts.
The law allows the use of reasonable, non-deadly physical force to prevent the theft of property.
Deadly force is permitted under certain circumstances in the defense of "highly defensible property"--not the same as theft.
Texas alone permits the use of deadly force to prevent theft, but only under a hopscotch of conditions, and again, the expenses would surely outweigh any benefit unless the property were prize breeding stock--if then.
Sorry.... but I do check my facts and you sir are wrong...
In Maine, the law specifically authorizes deadly force to prevent arson or criminal trespass... you have to give them a command to stop... but if they do not immediately comply, deadly force is legal.
§104. Use of force in defense of premises
....
3. A person in possession or control of a dwelling place or a person who is licensed or privileged to be therein is justified in using deadly force upon another person:
A. Under the circumstances enumerated in section 108; or [PL 1975, c. 740, §26 (NEW).]
B. When the person reasonably believes that deadly force is necessary to prevent or terminate the commission of a criminal trespass by such other person, who the person reasonably believes:
(1) Has entered or is attempting to enter the dwelling place or has surreptitiously remained within the dwelling place without a license or privilege to do so; and
(2) Is committing or is likely to commit some other crime within the dwelling place. [PL 2007, c. 173, §20 (AMD).]
[PL 2007, c. 173, §20 (AMD).]
4. A person may use deadly force under subsection 3, paragraph B only if the person first demands the person against whom such deadly force is to be used to terminate the criminal trespass and the trespasser fails to immediately comply with the demand, unless the person reasonably believes that it would be dangerous to the person or a 3rd person to make the demand.