I didn't know this, but apparently I'm lost

According to the State of Israel, anyway. This seems like a bad idea for an ad campaign - "Hey, half-breeds! It's not too late to atone for your parents' evil race-mixing ways and become really Jewish!" In particular, it seems like a bad idea for a state that pretty explicitly acknowledges its racial/religious-supremacist ideology, and uses that ideology to commit war crimes and illegally occupy territory.

I'm not particularly anti-Israel. I think Middle Eastern politics and history are too complicated for me to really be "anti-" anyone, since at this point everybody involved has a complex history and set of circumstances they're reacting to. And Israel does a lot of things right, much more so than basically any other state in the Middle East, with a few small potential exceptions. But it clearly has a "dark" side, one that's just as anti-Democratic, racist and frightening as any other state in the region, and ads like this make that unfortunate aspect of Israel quite clear.