It’s not one extreme or the other. I have no idea why it’s “inevitable”. I own a gun and I haven’t mentally devolved into the Punisher yet.
Imagine you live in a rural area where things are far apart. Someone breaks your car, and now you can’t get to work. And if you don’t show up for work, now you’re fired. And now you don’t have income, so now you might lose your house or miss meals. Asking that person to have sympathy for the thief is asking for a lot.
No one here is arguing that it's OK for people to steal essential parts from cars, just that it's morally reprehensible to kill that person for doing it, if they aren't threatening your life.
Livelihood and life are separate things. In the situation someone gets fired for missing a day of work, you should be arguing against the ability for an employer to fire someone for something outside of their control, not for the ability to kill someone for a non-violent act.
Also, your example of harm is nuts. Someone steals your catalytic converter you can still drive to work, the car still runs it’s just loud. So, see, you own a gun and you’ve already talked yourself into a situation where having a catalytic converters is some life threatening event, worthy of taking someone’s life for, or at least not having sympathy for. That’s callous. If I were you I’d rethink that position.
More to the point, if some other driver isn't paying attention and damages your car to the point it's inoperable, are you justified in shooting them? In most cases, they won't face any criminal liability even (perhaps a minor ticket).
No one accidentally steals a catalytic converter. You have to plan it ahead of time and you need to acquire special tools to do so. This is not a crime of opportunity where maybe you find 100 bucks cash in a wallet on the street and you just grab it.
As for the first point... we I don't know how to convince you but those people exist. For us, the privileged software developers, you can dial in to work and submit code remotely. You probably get paid enough and get PTO to take a couple days off work if you can't make it. But there's ppl who are not so fortunate.
I don't have examples of ppl who became destitute, but look at this news story where the school faculty by this janitor a car: https://youtu.be/XqyvWqYVHcU
Look at 0:17 where he describes a 4 hour commute with 3 separate bus lines
Now if someone was trying to steal this man's catalytic converter, and he shot them. Well of course it would definitely depend on the exact circumstances, letter of the law, and charges pressed, but at a glance I'd say man, I understand it...
For the record, I'm immune to catalytic converter theft because I don't own a car. I've had bike wheels stolen multiple times though, and that's no fun, but certainly no justification for murder.
I think we have largely done this to ourselves, and catalytic converter theft is the result of the unforgiving social and economic climate. That said, stand your ground laws and castle doctrines do not result in lots of murdered criminals. Despite people's theoretical support in this thread of shooting people who are robbing them, it does not happen much and most of these people value human life far more than their support indicates.
People have looked beyond fearmongering at these policies, and unbiased research (which is why it is banned from being federally funded) always shows castle doctrine / other stand-your-ground laws are not a net benefit to reducing crime and lead to avoidable deaths of innocent people (https://www.rand.org/research/gun-policy/analysis/stand-your...)