Because in a parliamentary system one has to have a coalition with a majority, and if not, they have to call an election. The government can’t function otherwise. A proportional system with a low blocking percentage allows for many small parties with radical agendas, which is complicating the process. If they had single member districts with a majority required to win, there would be very few people from religious parties (but more religious candidates in all the other parties), and very few if any secular fanatics getting elected – though one should note a strong Jewish tradition of proportional representation.
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