Even in countries with alternative voting systems or grouping systems besides first past the post or winner take all, they haven’t managed to be a challenge to bourgeois democracy. Japan ( which also has proportional representation ), and australia ( proportional and uses ranked choice voting ) both have right wing / neoliberal govs. You might be able to blame capitalist control over media for that one, who are going to give vetted pro capitalist candidates the airtime and legitimacy.