All designed to perpetuate the idea that there is something unique in the genes or the blood, when it is purely a cultural heritage. The false accusations that certain people have Jewish heritage works in favour of this mythical genetic uniqueness, because by refuting the false accusations that Putin or the Taliban (or whoever) have Jewish ancestry - one is giving credibility to the notion that it is a genetic religion.
To perpetuate such a myth requires the arrogance of a Huge hoax or false flag, like 911 etc.