I used the term "minority" in a generic sense, denoting any more-or-less organized interest group that is in a numerical minority.
Of course, I am not suggesting that proportional representation (PR) is a panacea for political inclusion - but such an inclusion at least has a chance under PR - but it does not stand one under the winner takes all system. This is so, because the majoritarian system is susceptible to what some analysts call the "median voter" phenomenon - that is an expectation that voters would oppose political support for 'special interest" groups. As a result, political representation based on the majority rule seeks the lowest common denominator while exluding all special interests. Especially that open support for special interest makes that party susceptible for negative campaigning, encouraged by a two-party system.
Under the PR rule, however, even a small minority group can count, because its votes can expand a party's share of power. Another way of thinking about it is the marginal utility of votes according to th elaw of diminishing returns. That utility is much greater for a relatively small party than for a large one that needs only 51% of the votes to win.
Wojtek