In Britain, criminals were stealing the thick, copper cables used for power and signaling of the railway. They wrapped a chain around cables near a road crossing, attached it to a truck, and dragged a significant length of cable away, to sell as scrap.
That naturally means the railway can't be used for many hours, occasionally over a day, and costs a tremendous about to repair. (It is one of the most safety-critical large systems around.) There's huge disruption, as 600 people per train every 20 minutes simply don't fit on any other means of transport.
Compared to catalytic converters, the disruption to society is far greater, the replacement cost much higher, and the scrap value relatively lower.
About 10 years ago, a law was introduced forbidding scrap metal dealers from paying cash, and requiring them to check ID. That led to a 30% drop in theft.
Is that a reasonable law?