It's recognition that Israel has changed, and changed for the negative, since its grand inception. It has turned into much that it originally stood against: oppression, subjugation, occupation, suppression... American jews are realistic, not fatalistic. They see a better future for themselves without being shackled to Israel.
North Korea leader Kim Jong Un hails accord with South as landmark (Reuters)
from the article: U.S. Jews: Don't fall into the trap of fatalism