I already gave you the article that confirmed mixers are illegal.
No. There was an article about a lawsuit against a Bitcoin mixer. Not sure how that story ended but someone (even the government) filing a lawsuit and alleging things doesn't make it a fact.
But let's take this one step forward. If murdering others is legal in my jurisdiction does that mean I can murder anyone and even promote guides on how one should kill others? You have to think at moral level, if something is helping scammers get away, just don't promote it.
Let's take it one step backward out of a fallacy land. Privacy is not murder. Scammers would get away without mixers just fine (using XMR for example) and not having mixers would limit the choices for legal uses while doing nothing to stop the scams.