Theft is a very inefficient tax on civilization.
Stealing copper from power lines and transformers is among the least-efficient kinds theft; it's hard to do worse without shooting a wealthy philanthropist couple to steal a wallet and a pearl necklace. I have seen a term suggested--the "rapacity index"--for the ratio of value gained by the thief, to value lost by the victim. I think it makes sense to take a crime's rapacity index into consideration during sentencing.
Yes, that's why I specified an unattended wallet. I agree that direct monetary loss is not the total harm to the victim.
> corruption has a low rapacity index, since the state has a lot of money compared to the amount of the transaction.
That's not the calculation I suggested. Corruption isn't always the same as theft--and, if it were decided so, the calculation for corruption would be the money absconded with by the taker, divided by the money lost by the victim. In many cases of corruption, as in power line theft, the victim is diffuse; it's usually harder to calculate exact numbers, but this kind of calculation is done in court all the time.