I didn't want to dredge up all of those past allegations against OgNasty--mainly because I never quite looked into their validity--but that's the first thing that came to mind when I saw that he's railing against the supposed immorality of mixers. 

There's nothing inherently wrong with wanting to keep your financial business private, and that includes obscuring your coins.  Sure, money laundering can and surely has been perpetrated using mixers, but is there any data showing the relative magnitude of laundering via mixers vs. the traditional way, through fiat-based businesses?  I get the sense that the latter is much, much more of a problem and that people/organizations with huge sums of money to launder aren't doing it through crypto, and if they are, there's probably fewer of them employing mixers, if only because of the enormous trust issue involved.