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I heard someone say 'Proportional representation is how the Nazis got in'....
Although I've never really seen the "it keeps minority extremist parties out" as a valid reason against it - you can't blame PR for people voting for extremists and not wanting extremists to get in isn't really a valid reason for not having a democratic process that reflects the will of the people.
I did all this in history at A-Level about ten years ago so forgive my sketchiness on details but FPP would have made it far harder for them.
What you've got to remember is that the more seats a party gets the more it builds momentum and under the FPP the momentum is hard to build. Under FPP most people won't vote for a small extremist party (which the Nazis were at first) because they know it won't get elected and they feel they'd be wasting their vote. Compare UKIP's performance at the European Elections (where there is a PR system and hence people know they might be elected) and the Parliamentary (where they barely picked up votes, let alone seats). OK, you can say the Euro Elections are fundamentally about Europe but policies on Europe are still important to people at general elections.
The reason for the vote drop is everyone lives in a constituency where only one of two people can get elected and so many people against the party who has the seat will vote for the person in second place to try and force them out. In a PR system tactical voting's no longer necessary so people will vote for who they like.
It certainly made it much easier for the Nazis that they only needed (I think) 5% of the vote to be represented in the Weimar Parliament. And once they had representatives in there;
a) there was a snowball effect because people saw them as credible and saw that other people were voting for them and hence felt they could do.
b) the nature of PR is that there are more collaborative governments so a small party like the Nazis would have had an influence and become a crucial political figure a the way that's almost impossible for UKIP, the BNP or even the Greens in a standard FPP system where they're just another small party whose votes are constantly defeated by the majority government. And the more influential they became the more people were inclined to vote for them.
Stating that extremist parties are more likely to succeed under PR than FPP isn't at all controversial. It's a simple statement of fact.
I could be wrong though.