You can't use lethal force to defend property...Those doing the stealing aren't necessarily constrained by those same rules.
The people doing these kinds of crimes around here are more likely to just open fire on you if you confront them then they are to run away. Charging out into the night in your undies to scare them away is a dangerous proposition.
They can shoot you dead and they'll be back out on the street before your corpse even makes it to the morgue...Assuming they even get caught at all.