His "close contact" mostly involved making and then breaking a peace treaty, then butchering the men and taking the women and children to be forcibly converted to Islam. Oh, yeah, and the women he captured were fair game to be raped, because that's how conquest of non-Muslims works according to Islamic law.
The Jews were integral in the Moorish occupation of Spain.
The only reason the Jews lived with Muslims is that there were a lot of Christians who were murdering Jews wherever they could find them. They weren't always treated wonderfully in the Muslim world, but at the time they were much better off there than under Christendom.
It should come as no suprise that at least some Jews are siding themselves with Islam against the United States.
This is one man, and we don't know his motives or anything else, not "some Jews." There is a Jew who is helping Robert Mugabe, and he's doing it completely out of greed, not because "some Jews" have an ideological affiliation to Mugabe. Heck, there are Jews who aid Palestinian terrorists. Anyone who claims Jewish people are perfect is a liar, and anyone who holds them to that standard is a racist. How can other Jews account for the behavior of lone wackos, any more than Catholics could have taken responsibility for McVeigh's actions?