You're right that politics is (partly) about actual disagreements in ideology that can't be hand-waved away. But that being said, there are more than 2 ideolog

You're right that politics is (partly) about actual disagreements in ideology that can't be hand-waved away. But that being said, there are more than 2 ideologies in the US! And I think that begs for a system with more than 2 political parties. When I lived in the Netherlands, I was struck by how there were 21 parties with at least 1 seat in parliament. And I think that led to a healthier political culture, where the parties would form different coalitions each electoral cycle, instead of a constant Us vs. Them, year after year.