But if the guy is caught in the act, you can bet the gun is coming out in preparation for some type of confrontation.
Likely result: arrest, conviction, and imprisonment of the person who drew the gun.
Incidents such as these have been appealed all the way to state supreme courts, and the answer is always the same: one may not threaten deadly force to protect tangible, moveable property.
There is one exception: one may do so to stop a thief in Texas at night if there is no other way, or to prevent the taking of property immediately after a burglary or robbery at any time of day, again if there is no other way.
So--is it smart to try that in Texas? Suppose there is a 97% chance that the actor would prevail in court--that he could demonstrate necessity. That means there is a 3% chance that he will lose everything
--his fortune, his freedom, his record, and his gun rights. Not a good risk, methinks.