Assuming it's legal where one lives to use deadly force to protect property under "X" circumstances, then the question becomes a simple moral one: Is it right, under YOUR own set of morals and values, to kill or maim a thief for stealing or attempting to steal? Everyone has to answer that for themselves. I say, hell yes, absolutely, the #@$%#$% deserve to die for stealing MY crap that I've worked hard for, (espec. in the case of the OP, in light of how many times he has been victimized). Would I actually do it? Depends on all the facts and circumstances and the age of the offenders. If they're just kids, then no I wouldn't shoot them - we've all done stuff as kids that was incredibly stupid. But if they appear to be older than about 22-25 yrs, then they should know better, and it's time to protect my stuff and cleanse the gene pool (if legal). This has the added benefit of acting as a general deterrent to other thieves, as well as the thief who is now in the cemetery, who will not re-offend against me or anyone. But I grew up very very poor, so my values and morals on the subject have been affected by how very hard I've had to work for every scrap of material belongings I have. So heck yes, it's right *in my view* to kill someone for stealing my hard earned stuff. I am quite certain that had money been handed to me by my parents on a silver spoon, as it was with many many of my high school, college, graduate school, and other acquaintances, my views on the subject would be radically different. Your mileage may vary, and there's nothing wrong with those values. Regardless of values, the law in your particular locale must be followed, of course.
P.S. Although there are benefits of killing the suckers, there are of course also significant costs and downsides that must be weighed against, including: Is the scumbag in a gang which will retaliate against you for killing one of their own? The mental/psychological trauma of taking a life, which may or may not affect you. The literal physical cleanup costs of blood and guts, etc. Potential lawsuits by the victims family. Even possible criminal charges, if it's not a clear cut case within the law's parameters, or you have an anti-gun DA where you live (in a Texas border county). It all must be taken into account. But as I mentioned, the biggest factors for me would be whether or not they are "just kids" (under 20 years), as well as the extent of the value of the stuff being taken, and all the particular facts and circumstances of the incident.