Every Israeli carrying a foreign passport that could be used for the ultimate goal of the safety of the State Israel will provide his passport to be used by Mossad. This is a matter of heroic patriotism." A matter of stupidity actually. The Israeli Government could just issue them with any identity they wanted. No need to compromise innocent Jewish people or for them to volunteer their passports for espionage.
Monitor: Airstrikes hit Islamic State stronghold in Syria, killing at least 13 (Reuters)
from the article: Report: Mossad used Australian passports before Dubai row