A lot of the apologists for this are making arguments along the lines of "being decentralized doesn't make you exempt from the rules" or "imagine if a bank laundered this much money". The problem is it doesn't make sense to treat protocols like companies. And it definitely doesn't make sense to treat protocol devs as if they were the executives of those companies. The CEO of a bank and the lead dev of a protocol have…
Isn't this kind of like the dev of SMTP getting arrested because two people committed a crime by communicating through email?
A knife is widely regarded as a tool that's legal to own and that, save a few precautions, you can carry with you. Switchblades, despite being also knives, are widely considered dangerous and their sale and possession is overall restricted (presumably) due to a strong correlation between the presence of a switchblade and stabbings.
Just because SMTP and Tornado are protocols it doesn't mean they are the same - one is a protocol enabling a wide range of activities (some of them criminal, some not) while the other is literally designed to hide the origin of money, an activity that most governments frown upon.