Only priority for governments is indeed that people pay their tax, plus that they know what level of wealth you have. All other things are just sloppy excuses.
It's well know that the far majority of the Bitcoiners aren't willing to declare their holdings to their local tax agencies, and rightfully so. But the results are more severe sanctions in the coming years.
If we don't bring the money we "owe" the governments to them, then they will come and get it by force. Every potential Bitcoin related services will be subject to this barbaric practice where they just look to nurse their hunger for control.
So yes, mixers are a crucial part of achieving freedom. And exactly that is what governments don't want you to have. They just want everything to happen within their system so we can continue being a slave of the governments.