But with Jews the ones who are leftist are more concerned about abandoning leftism than they are it being a breaking of core Jewish identity

I do somewhat agree with your point, but you have to keep in mind that features of leftism stick closer to Jewish core identity than you might think. Namely, diversity and feminism. Almost all activist Jews endorse both, regardless of where they are on the political spectrum. That includes Roseanne and Ben Shapiro.

Stephen Miller appears to be a notable exception, at least as far as diversity is concerned.