So far we havn’t been able to drag one out of Jason or John Humphreys. Rather they have expressions of sentiment that some things are even worse then a carbon tax. Its an argument to put needles through the taxpayers testicles in preference to the eyeballs.
Other than that we have the implication that government spending is sancrosanct and must never be cut, which is of course morally outrageous. John reiterates this implication by calling for revenue-neutrality. A demand that stays with him always.
But still we have no justification for the carbon tax. We have expressions of sentiment that an increase in the tax free threshold would be a good thing. But with implied demands that this must not be done without a carbon tax. Why not raise the tax free threshold, cut spending, and be quits with it?
We do not have a justification for the Carbon tax. Nothing has changed here. John is unwavering in his support for a carbon tax. But he will not justify it.