That is a reason to launder money, it's still money laundering. It's valid to believe that this justifies money laundering and to believe that money laundering should be legal, but it is what it is.
Money laundering is the act of hiding the source of funds from *illegal activity*, all my funds that I want to privately transact with are legitimately earned.
I know this is a troll, but Tornado Cash literally provides a frontend that lets you prove where funds came from / went to auditors and law enforcement.