In political science, the conventional view is that polarization observed in the US is not a product of the two camps drifting further apart (in the sense of having more extreme views), it's the product of issue divisions aligning more closely to partisan camps. Consider Kim Davis. Kim Davis was a county clerk who went to jail after illegally refusing to issue a same-sex marriage certificate after the court system ru…
All of this seems to have an unstated prerequisite: The US two party system where voting for a third party actively damages your own interest. It's not perfectly solved in other countries, but having more "evils" to choose from is a good start. Obviously politicians have have little incentive to change the process they already had to master to gain power though in the first place.
But the US is a presidential system. While the presidency isn't everything, it is a big enough prize. No system can get around the winner-take-all nature of the presidency. I favour ranked choice and/or MMP and would support any reform proposed to achieve better institutions of electoral representation, but nothing is going to get around the fundamentally two-party nature of the contestation of the presidency. If we look at the whole history of the US, the party system has changed a number of times, but each time it has been around assembling roughly two groups contesting the presidency, regardless of how those groups map to formal parties (not at all in the JQA/Jackson era, very strongly today).
Still, regardless of the institutional setup, it's the case that inter-party polarization can emerge from either increasing extremeness, or better correlation between party and ideology, or better correlation between multiple dimensions of ideology, and the same processes I mention above are visible in other multi-party countries as well, to a lesser degree.