As shown by the Harper era, FPTP does not guarantee centrist policies. FPTP gurantees that extremists can win influence by winning with regional issues. As shown by the Blocs rise during the 1990s. 

PR, on the other hand, guarantees centrist policies because coallitions have to negotiate and give and take on selected issues. As shown by the hundreds of coallition governments that rule and have ruled in Europe and Asia over the years. 

And, no extremists only gain influence if the centrist parties are too immature to put bickering aside and negotiate coallition governments.

Canadians deserve PR. It will restore faith in our politicians and help increase voter turnout.