Most of the MSM is publicly owned so strike out "owners." MSM editors or producers aren't introducing any slant into stories.
I'm not aware that CNN is heavily Jewish. I don't think American Jews tend to be all that sympathetic to Israel anyway (for example, they're more likely than American Christians to say that Trump is too pro-Israel).
I think a lot of hardcore politics fans don't realize how unusual they are, and can't really get their heads around how other people have other interests. It's like if you had a group of pro- or anti-ketamine people thinking, "well, of course news editors are going to insert their views about the effectiveness of ketamine into their work."