From my point of view, mixing isn't inherently criminal behavior either.... As a matter of fact, many people (including myself) use(d) mixer to increase their privacy. It's nobody's business how much BTC i hold, that's private information (just like my FIAT balance on my bank account).
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Secondly, your FIAT balance on your local bank isn't your privacy; I'm not sure what term your local banking system operates with but, I'm sure that if a huge fund drops in your bank for the first time, they'll likely wanna trace where, how and to what the funds goes for..
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you're right, if my fiat bank account received a lot of money, my bank would probably notify the government. If i'm not mistaking, in my country the tax authority can even request to take a look at all your bank statements...
What i actually wanted to say was more or less pointed towards a $5 crowbar attack. If i can no longer anonimise my funds because the government simply makes my privacy illegal, they open me up to malicious people tracking how much funds i have, picking up a crowbar and visiting me at home. In this usecase, my fiat bank account has even more privacy since only bank employees and government agencies know how much FIAT money i have, and they won't come to my home to hold my child and my wife hostage untill i give them my visa card and pin code (they have other, less violent, ways to rob me).
I personally think the governement is trading in my privacy AND SECURITY for their convenience in tracking down transactions used to pay for illegal activity's. I'm all for putting bad people behind bars, but i'm strongly opposed to sacrificing my anonimity, security and freedom so they have an easyer job finding those criminals.