I happen to disagree. There was a good reason why horse thieves were hung when caught, and nobody complained if they were shot (unless they got stuck burying them.) Stuff costs. And you pay those costs with a portion of your lives. Which means every theft is stealing some of your life away. Those folks who don't think shooting a thief is worth it, don't particularly value their lives, either because they truly have worthless lives, or are just ignorant of the connection. And one of the reasons why we have so much stealing is because there aren't strong consequences being applied to it. The thieves certainly aren't worried about paying for it in the afterlife.
Disagreement is fine, your right under the Constitution. And, you provide your logic and opinions for doing so.
I can only point out that
this site, which apparently has studied the question, says that the laws of all 50 states disagree with your point of view.
"Shoot a Robber, Not a Thief
Self-defense laws throughout the nation see crimes against persons differently than crimes against property. In most states, you can shoot someone committing a felony crime against your person. In no state may you shoot someone committing a crime against property."
I get it, you are not in support of the legal process of law enforcement, judge, jury as enacted by the Will of the People in each of 50 states, but rather favor a return to summarily hanging/shooting/killing an accused (by you only) thief, expecting that you can personally carry this out without personal, emotional or societal repercussions. And, this is justified, in your mind, because the vast majority of people in the US have "truly worthless lives, or just ignorant...."
Certainly a novel but not unique view...could be that there are clauses in the US constitution and laws in 50 states simply because the opposing view needed to be formally stated, along with penalties for those not adhering to the common view.
I certainly hope that you never act on your belief, because your post in this thread would be front and center evidence of your predisposition and prior planning to shoot a thief who has not confronted you with bodily harm. Ramifications in the afterlife aside, payment for such an act would surely result in prison in any of the 50 states.
I stand by my statement:
...Nope, as aggravating as theft is, stuff isn't worth shooting someone over, lacking deadly threat during its commission, which makes the theft moot and self defense paramount.