As far as I can tell[1], any miner that does NOT verify the identities of the source and destination of a bitcoin transaction, and these happen to involve illeg

As far as I can tell[1], any miner that does NOT verify the identities of the source and destination of a bitcoin transaction, and these happen to involve illegal transactions, are guilty of money laundering under Swedish (and probably most countries') law. In that law, anyone who actively assists in the transference of valuable tokens need to ensure that they're not assisting in the transfer of value that originates from crime. And since a miner has explicit choice of what transactions to include in the block, this means that they cannot hide behind a "common carrier"-like[2] exception. [1] Nope, don't even pretend to be a lawyer in secret, and I may have missed some subtleties. [2] This is basically what protects the inter-bank transfer services, the banks themselves are on the hook for preventing money laundering transactions to get that far. But since anyone can place a transaction into the pool, this is not applicable.