[dane-pgp]

But has the ability for people to vote for One Nation specifically lead to bad government policies? Under a less fair voting system, might a minority of extremists have been able to take over one of the major parties (or at least might one of the major parties have adopted extremist policies in order to secure the vote of the extremists)?

I think it would be very naive to imagine that making the voting system less representative would make people just give up on their extremism and peacefully accept the policies of one of the major parties. If anything, I would guess that showing how little support an extremist party has would disabuse its voters from believing they represent some sort of oppressed majority.