I don’t agree that you should shoot someone for stealing your catalytic converter either, but just for the sake of argument…
So what if the argument that having your car disabled could spiral you into homelessness is more of a critique on our lack of a safety net? What can the average citizen do about that? At this point, not very much. The system is cruel, yes, but it’s the one they live in.
In my city, catalytic converters thrives are known to be highly organized, armed, and prone to violently confronting people who try to chase them off. A few people have even been shot for trying to do so. The police are too busy with shooting after shooting to do anything effective to try to stop them. When you have a group of people going out night after night, stealing with impunity and threatening anyone who gets in their way, it becomes very difficult to muster any compassion for them.