Proportional Representation makes it more difficult for single parties to dominate the Government without forming a Coalition

The function of Government is to set the law and limit freedoms, many limitations to our 'freedom' are justified as with typical crimes, we do not have a right to steal for instance.

When we come to vote we will be given a choice between parties which offer some freedoms and some protections. The advantage of a proportional system of voting is that we have no need to vote for a party with constrains us unnecessarily (limits our freedoms) given that we likely have the ability to choose a party which provides the protections we want. If a party, such as a hypothetical extreme Libertarian party chose, for example, to provide no protection against theft it is likely that voters would choose almost any other party, even a Communist party as an alternative. People prioritise protection over freedoms, often with good reason. If the choice available to voters is narrowed, as with First-past-the-post, this means that to get the protections we want we must give up many freedoms. A party seeking to win a Fptp election must offer protections (restrictions) that a bulk of voters demand, if they do not satisfy those requirements they will lose. A different system would mean that other parties than the Fptp mainstream parties can do well in spite of not offering all the 'protections' provided by the mainstream parties, because not all voters require all the protections. A voter who has a weakness for State protection in a particular area, under Fptp doesn't mind that, very often, many other freedoms are removed by voting for the collectivist party, they do not mind because they have been given what they want. To get a Libertarian Government under Fptp requires the electorate to be particularly educated about natural rights, and it is often too much to expect. With PR it doesn't matter (so much) if people are ignorant and selfish because the system makes it more difficult for them to steal from each other. PR makes it more difficult for one party to have control of the Government.