The reason for the “Jewish grandfather” rule was that it mirrored the Nazi definition of being Jewish. Israel after WWII didn’t want to throw up any roadblocks to Jewish citizenship. They wanted anyone who could be persecuted for being a Jew to be able to emigrate to Israel.
Times have changed. There have been incidents of “Russian Jews” emigrating to Israel and turning out to be neo-nazis. That is one of the main drivers for reforming the right to return.
“There have been incidents of “Russian Jews” emigrating to Israel and turning out to be neo-nazis. ”
Do you mean classical “exterminate Jews” Nazis, or just “firmly against socialism and the Left’s agenda” Nazi?