Fact actually is I wouldn't like to put too much of a blame on mixers because everything that has a good side has a bad one too so you should definitely expect hackers and scammers to exploit the bad side too just like good enthusiasts will exploit the good side which is simply maintaining privacy.
But it would have been good if they are helpful at times. I remember the time over $100 million was stolen and Sinbad was used for mixing the coin. Did you know that caused Sinbad to be taken down? People needs to be worry of Lazarus group. If Sinbad was helpful, Mixers campaigns will likely still be on this forum.
Some government and blockchain analysis company doesn't even care whether mixers (along with similar tools) have legitimate uses. Although FWIW that news also mention DEX, CEX and other services which speculated will be used by the hacker.
I have known those Dex which are actually not totally decentralized but web3 to have been used by hackers in the past. I think I even had some posts about it in the past.