It is not only leftests who have 2nd passports. I remember chatting with a a settler (with an American Passport) who helped his grandchildren qualify for their American Passports. I tell my children if they ever have trouble travelling never use their Israeli or American Passports, but their French ones instead. They will be safest that way.
U.S. State Dept. 'deeply concerned' about Israel's approval of new settlement construction (Reuters)
from the article: Fear is driving Israelis to obtain foreign passports