Why are mixers legal? The only purpose I find on them is to money launder. They are literally useless if you don't have anything to hide.
Why would swapping some bitcoins for other bitcoins be illegal?
Analysis has shown that the majority of mixers' traffic comes directly from centralized exchanges, by users who are simply looking to increase their privacy. There are a thousand good reasons a user might want privacy despite doing nothing illegal. If you truly believe that you don't need privacy unless you have something to hide, then please share your real name, address, internet browsing history, email accounts and passwords, and social media accounts and passwords publicly in this thread, so we can all have a good look through your private life and publicly share what we find. After all, you don't have anything to hide, do you?
The "nothing to hide" argument as been widely debunked:
I don't need to spend a lot of time dismantling the "nothing to hide" argument,
because it is already widely discredited. I will share one of my favorite quotes on the topic though:
The old cliché is often mocked though basically true: theres no reason to worry about surveillance if you have nothing to hide. That mindset creates the incentive to be as compliant and inconspicuous as possible: those who think that way decide its in their best interests to provide authorities with as little reason as possible to care about them. Thats accomplished by never stepping out of line. Those willing to live their lives that way will be indifferent to the loss of privacy because they feel that they lose nothing from it. Above all else, thats what a Surveillance State does: it breeds fear of doing anything out of the ordinary by creating a class of meek citizens who know they are being constantly watched.