Even though this discussion was started by a Jew Hater it nevertheless serves as a reminder to look into the question of how certain are we that the Ethiopian immigrants of Israel are Jewish
see
http://en.wikipedia.org/wiki/Beta_IsraelBasically, some believe they are while others have a doubt or might even say they aren't.
If they are, according to DNA research, it seems that at least the average Ethiopian
Jew must have been descended from converts and if so the question arises, was their original conversion done by an Orthodox Beit Din.
However, you might want to cast doubt on how much can we rely on DNA research to determine halacha and in any case, I am not trying to prove one side or the other in the debate over the Jewishness of the Ethiopian_Israeli immigrants. I am just raising the issue for further examination.
In any case, if Ethiopian immigrants underwent a new conversion in Israel {some have done this} in front of a legitimate Orthodox Beit Din, and accepted upon themselves halacha, at the time of conversion, then those individuals are obviously full Jews.