What we knew all along, from the CBC today:

"The prime minister's principal secretary, Gerald Butts, responded to criticism of the proposals on Wednesday morning with a recognition that the measures are not just a question of fairness but also of boosting government revenues.

"If we all want the Canada we say we want, we have to pay for it. If our government encourages our wealthiest citizens to opt of progressive income tax, we will not be able to do that."

More explicitly, one would have to assume that would be the Canada that Mr. Butts wants using our money....

This is nothing to do with "fairness" it is simply another increase in taxation that will never cease.