Is it any coincidence that Israelis and Palestinians are closely related genetically?

A study by Ariella Oppenheim and her colleagues, published in Human Genetics in December 2000, showed that about 70 percent of Jewish paternal ancestries and about 82 percent of Palestinian Arabs share the same chromosomal pool. The geneticists asserted that this might support the claim that Palestinian Arabs descend in part from Judeans [Latin, Iudaea'] who converted to Islam. Not Judahites.

With their closer relationship to Jews, the Palestinian Arabs are distinctive from other Arab groups, such as Syrians, Lebanese, Saudis, and Iraqis, who have less of a connection to Jews.

Is it any coincidence that Israelis and Palestinians are closely related genetically?