Cool! Can I go to the mall and shoot shoplifters, too?
No that’s not what Castle Doctrine is.
Only if the shoplifter shoots at You or aims at You first or is shooting someone else.
Again this is Texas I’m talking about. Other States maybe but I’d check with a Lawyer, check the NRA they have a list of States Laws. The text I posted was from a Wikipedia page for all States.
Your mileage may vary.