A fine piece from Canada's laziest armchair moralizer.  

What could be a thoughtful assessment of identity politics turns into Wente's usual polemic about fringe groups ruining her vision of a just society. 

Apart from a massive oversimplification (and biased reading) of what Marxisim and poststructuralism teach, the idea that subversive elements have 'infected' academic and social terrain is more J. Edgar Hoover than a Liberal defence of freedom of expression. 

Let's also consider that her facile logic, scapegoating and small-minded rhetoric bears plenty in common with the words and convictions of actual extremists. I'd appreciate [any] facts behind the statements:

"He’s a white man, and therefore guilty." 
"the steady rise of authoritarian [?] illiberalism on the left"
"power positions have been taken over by the radicals [?]"

Margaret's alarmism and condescension betray a lack of respect for difference of opinion, however wrong. We need more of that respect, not less.