I am a strong believer in the right to privacy (even if some people take it what I believe to be too far), and a centralized mixer has the potential to enhance privacy. Also, however, mixers have the potential to give nothing more than the illusion of privacy and highlight your transactions to governments and other nosy people.
I agree. Anyone who uses a mixer should consider that they might be a honeypot. And that's why it makes little sense for a real criminal to put these services above Monero and coinjoins, which are trustless.
There tends to be a good amount of coin that flows through the various mixers originating from criminal activity. This is why governments have employed resources into shutting down mixers and finding their operators.