My point is the DNA argument is flawed because Ashkenazim DNA is heavily European AND the cultural argument is flawed because Ashkenazim and Sephardim are heavily European, starting with the facts that they used Germanic and Hispanic languages respectively.

Do you argue that Nazis were partly right? People who seek to drive others from their homes are always wrong—which is why you'll never hear me saying that European Israelis should go back to Europe. If they want to stay in their homes in whatever Palestine and Israel become, they should be free to, so long as they're not occupying stolen homes.