Of course MOST Jews are discendants of ancient Israel,
just like most Christians and Catholics are Caucasians.
Those black jews, yellow jews don't count when we talk about Jewish influence on, or contributions to, science or politics just like we do not count those black Christians and yellow Christians when we talk about Christians' influence and contributions.

Therefore, the comparison between Jews and blacks, or between Asians and blacks makes a lot of sense. There has to be a biological root when a discrepancy over 1000 or 1 billion times arises.