You need to read something besides myths. The Jewish diaspora is older than the Romans. And the Romans didn't expel the Jews from Palestine, only from Jerusalem. This ban was lifted only a few hundred years later, so any Jews who thought they had been exiled have been free to return almost all this time.
Law expanding definition of terrorist activity passes first Knesset reading (Haaretz)
from the article: Fear is driving Israelis to obtain foreign passports