> In a sane election system, 20% gives a party a significant position in the government that influences the coalition and drives some of the future decisions. Just not in the two-party circus.

There is no consensus among political scientists that either a two-party system or a multi-party/coalition system is inherently “better.” Each design produces different trade-offs in representation, stability, accountability, and policy outcomes.

...or everyone else decides to marginalize that 20% party and allies with the far right instead (I don't want to defend the US system, but proportional representation is not a panacea either).