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). But this didn't stop the world's governements of attacking all mixing services, so i don't see why they wouldn't increase their attack surface by making every service that isn't 100% KYC and actively working with them a valid target.