Isn't that a part of the attraction of bitcoin? You can AVOID tax?
Nope. It doesn't have that property.
Don't be pedantic.
You may not be able to use Bitcoin to avoid taxes
legally, but from a practical point of view as long as you can still conduct Bitcoin transactions anonymously you can use Bitcoin to avoid taxes. The Blockchain may be public, but provided the likes of Mike Hearn don't succeed in getting blacklists and similar 'taint' concepts implemented ways to transact anonymously will continue to exist.
It would be better if core developers stay out of politics rather than keep trying to insist that Bitcoin has nothing to do with taxes or illegal activity.