A tool is a tool, if bad people are using it for bad things, it is not the responsibility of those who are using it in a good way.
I completely agree with you, or are we going to advocate that the internet should be banned because that is where most of the crimes happen. It is the reponsibility of the government to go after the perpetrators of crime and not the tool or the developers, as long as the tool is legal.
We cannot be certain what might be the future of mixers, also this does not promote privacy, I reckon.
We should be smart enough to understand that no centralized government will completely support or promote privacy, that is not going to happen, but it is a step forward if they do not aggressively attack it.