What drove me most crazy about Trudeau's rapid betrayal on this one is that the frigging liberals really would become Canada's "natural ruling party" on a PR system. Even at their weakest they've always held enough votes to have remained strong and relevant if we used PR. However they know they'd lose the majority, and they'd rather lose entirely almost half the time than have an almost unassailably strong hold on the country that requires them to work with others.