If you don't want your transactions to be public, don't use a public ledger. You don't get to launder your money because you chose to use a ridiculous tool that made your transactions public and readable by anybody who has ever transacted with you or who can convince someone who did to tell them who you are.

Tornado Cash wasn't free, there was a fee which as I understand it was sent back to various developers.

Money laundering doesn't get to be something else and totally fine just because it's covering for a weakness of cryptocurrencies.