From the outside looking in: It seems to me that any group as small as the Jews would welcome anyone who is half Jewish and who places themselves under the covenant. Suppose Ishmael ahd told Abraham: I will not harrass Isaac anymore and your God is my God. Think how much difference that would have made in the Middle East of today.
Peru forces rescue 54 adults and children held captive by Shining Path (AP)
from the article: Expanding the tribe in the home of the brave