How so? And please address the system I mentioned (STV), since I already acknowledged that PR is a non-starter.
You will get a shift towards the extremes because you eliminate the FPTP imperative to fight over the middle. Parties can go after niches which will be less moderate and then cobble together alliances that reach towards the right or left edge of the spectrum rather than center. This happens under ANY system that removes the need to get plurality, including STV.
You will get a shift of power away from voters towards lobbyists because you remove the amplification of voter intention that FPTP creates. Those small shifts in votes that result in big shifts in government emphasize the importance of winning at the polls, as opposed to funding. So voters lose, lobbyists gain.
And note that those small shifts that matter ALWAYS relate to the most moderate voters, the ones right in the middle, where a 5% shift from one party to the other has a 10% impact (subtract from one, add to another) as opposed to a shift from the center to the extreme, which has only a 5% impact. In a race between the Liberals and the Conservatives, a voter shifting from L to C matters more than a voter shifting from L to N.
FPTP is an excellent system because it focuses the politics of the nation on the moderate center, which really is what you want in a democracy. You really don't want to empower the extremes. The actual GOAL of a democratic system is to have a government that is responsive to the majority of voters. That necessarily means a center left, or center right government, as opposed to a left or right government.
The US has FPTP and both parties increasingly disregard the middle in favour of pandering more and more to ideologues...
That's just nonsense. US elections are incredibly competitive, frequently coming very close to being 50/50 results. They are very much locked in battle over the most moderate voters. The rhetoric is about getting out the vote, but their policy platforms are squarely aimed at the average person.
Yeah, the US is way further right than Canada. The US Democrats are right of the Canadian Conservative party. But within the context of US elections, they are aiming at the swing votes.
I'd also argue that the Conservatives have been ineffectual in muzzling extremists: Cheryl Gallant is still the MP for Renfrew-Nippissing-Pembroke
Nah both the NDP and the Conservatives have been effective in muzzling their extremists. The Conservatives have managed to completely shut down every actual attempt to get abortion or same sex marriage on the agenda. Yeah, the extremists sit over in a corner and shout loudly, and the media picks it up and runs all their crap. But they are not getting any of their agenda on the roadmap.
Over on the NDP side, they are championing tax cuts for small business and the merits of the free market, and absolutely silencing the party wing-nuts who believe in socialism.
You are aware that STV has nothing to do with PR, right? Can you give me an example of an actual STV, non-PR system that produces results anything like Israel or Italy?
Sorry but STV is just a watered down PR system, designed to create a proportional result with a transferrable ballot rather than a party list. It's slightly better than PR in that the people who get elected actually had someone vote for them, rather than party list stacked with cronies from candidate 5 on down.
But it still suffers from the fundamental fatal flaws in PR by encouraging candidates to run on less moderate, more extreme platforms.
Although to be fair STV moves in the PR direction by an extent that probably doesn't matter in 19 out of 20 elections. It also doesn't produce results that are any less distorted than under FPTP. STV produces broken results just as surely.
Suppose that 49% of voters prefer the Conservatives, 26% prefer the Liberals, and 25% prefer the NDP.
Your argument is that it's fairest to have the Liberals in power because the NDP get knocked out and their vote transfers to the Liberals. But what if even 5% of those Conservative voters would rather see the NDP in power than the Liberals? Perhaps they think the Liberals are corrupt. Why is that a fairer outcome than having the Conservatives win? Or even the NDP?