You're stating this as if it's fact when it's really not. Tornado Cash was certainly not designed with the intent of criminal activity, but for privacy - and as for "significantly more for crime than not", I've not seen any actual evidence for this, only evidence to the contrary. People claim it's mostly used for crime, but those are purely conjecture, at least the ones I've seen are.
Again, claims of privacy is not enough magic to make them free from legal requirements for money laundering laws. Privacy claims do not make banks immune from money laundering. Privacy claims do not make anyone free from meeting legal requirements.
>those are purely conjecture
The above states ~1/7 of all money flowing through can be tied to criminal behavior. If true, that's an astounding ratio that would rightfully put a bank out of business and key players in prison.