He had no choice.  Several months ago the Gov't Canada ran an extensive on line survey pertaining to this matter. I participated and indicated by my answers that we can not allow proportional representation in this country because it would give too much sway to  single issue parties, the loony left,  the loony right, or a particular ethnic group. Some nut with an agenda could end up holding the balance of power in a minority government and hold the Country ransom for some crazy demand.  Presumably the majority of those taking the survey and those voicing their concerns by other  methods  thought so too. 
Parliamentary democracy requires big tent parties to operate properly. It's not perfect but it keeps things moderate.