That’s because “conservative” isn’t an ideology, and it never has been. Conservativism has two core beliefs: “conservatives” refers to a specific group of people defined by common traits, and those are the good people. Each tranche of conservatives defines their own identity, and then they define whatever they want as “conservative values.”

This German guy on the train probably is very conservative. He is not more progressive than an American conservative. He has simply defined his group of conservatives to include the people who benefit from universal healthcare. He sees the value to his own group, and so he supports it.