How can money stolen from bank accounts even be offramped? It makes perfect sense to me how it works within crypto—transactions are not reversible. But how does this work in trad-fi, can't any money transferred just be sent back by the banks by editing the ledgers?

>can't any money transferred just be sent back by the banks by editing the ledgers?

No, traditional western finance isn't like a unified database, but rather many controlled by different parties in different countries. In theory you could write it back, but it's closer to bittorrent - if someone downloads a song from you then you can't just take it back.

Some stuff can be voided and there are clearing house mechanisms but if money moves fast enough across enough borders then getting it back is near impossible

Stealing is one possible problem (transactions out of country are really hard to claw back), but the major fear is probably stability. You won't like the consequences if a significant percentage of your countries banks are down for a few days...