That Mr. Morneau was clever in managing his/his family's personal affairs when he was a private citizen is all well and good (as good as it is that those tax loopholes don't apply to the evocative "middle class", but that's another story). But you can see the dissonance in damning the middle class, now that the ruling class have their affairs all in order.
However, when Mr. Morneau became Finance Minister, he should have known enough to be like Caesar's wife.