There is also the bad side of having multiple left wing parties in the parliament. It shifts the overton window farther and farther to the left. That's why the CPC has to fish for LPC voters with liberal policies. And Trudeau has to go with even farther to the left with policies to get the NDP vote. In 20 years we will wake up and Trudeau will look like a Conservative.

Justine Trudeau has been importing voters by the 10s of thousands all over Canada for years

Harper did that too and if O'Toole wins, we will continue to import 300,000 to 400,000 a year.