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?
It's extremely difficult to compare, as both by their nature go undetected. However, there have been lots of instances of large banks caught to launder billions.
But, that's not the point. The main concern is that OgNasty morally supports decentralized mixing but opposes centralized mixing. This stance is simply nonsensical, even for someone with lenient ethical standards. You can't oppose software that helps criminals unless nobody is in charge of its operation. What fucked up morals are these? When using a decentralized, pseudonymous, and potentially anonymous currency, one must come to terms with the fact that criminals exploiting it, much like any regular individual, is an inherent aspect of the system.