Is bitcoin bad? Or should it not exist? You should also ask yourself this question since many also regard bitcoin as a perfect payment system for illicit transactions; they have labeled bitcoin as the most used by bad actors and those who have something to hide.
There will always be an abuse in almost everything that is created for good, but just because a few or many are using a particular tool to commit crimes does not make the tool unworthy to serve the good purpose it's designed for; a mixer is good and should exist.
If everything that could be used to launder money and sponsor illicit activities should be banned and not exist, then the fiat system should also not be spared. We all know where the big money laundering and terrorist-sponsored transactions always pass through long before crypto even comes into play. Bad actors have been operating, and Bitcoin and mixers just happen to fall into the wrong part where authorities have to use every bit of an excuse to condemn it. existence.