You do realize Lurie and Sirianni are still white. Jewish people are usually white, Italians are white. I got nothing against Siranni but I wouldn't call him a successful coach just yet. Going 9-8 in an awful division and getting beat handily in the wild card game isn't some great feat. That being said, I think he is a good coach.
Just because they're "white" doesn't mean complete cultural equivalency. Or some subconscious "affinity" based on skin color alone.
There were plenty of media pieces in the local Philly media hailing his emotional intelligence. He also did tweak the offense to fit his limited QB.
It took misconduct World War for the Jew to live in a tolerant and accepting society. Even today, their business successes or ability to enter occupations that require educational commitment are treated with revulsion or fear amongst select people.
Pre-WWII history indicates that both of those ethnic groups were not in the WASP circle. Street murders or lynching were all too common. Jews were universally reviled. Zeppo Marx only had a life due to circumstance. His friend was shot by a Irish gang that disapproved of a Jew dating Irish girls.
The Italians were also second-class for a while. The first "Columbus Day" was political desperation in response to a lynching of Italians; Italy was going to cut off diplomatic relations. While they are now assimilated, they sometimes wind up "Anglifying" their public names and their heritage is hidden as a result.
In the case of Leo Frank, his skin color did not save him. Wrongfully convicted, but his capital punishment was commuted to a life sentence. That didn't matter, as he eventually was lynched. The first anti-lynching memorial in the country was placed in the "Leo Frank Memorial".