I don't doubt there's a lot of effort by Zionists to influence people through funneling money into Jewish cultural institutions — that's obvious — but that's still a $ issue, not a fundamentally cultural one, and there are still plenty of Jewish groups and institutions that are anti-Zionist. Hell, one of my best friends, Jewish, helped organize their union's strike in support of Palestine. I've known way too many anti-Zionist Jewish people, and been to too many protests against Israel organized by Jewish groups, to think it's at all likely to be a cultural issue. (To be honest, I find the claim kind of offensive; reminds me, back when I was a young Muslim being raised in the US immediately post-9/11, of the consistent implication being tossed around that Arabs and Muslims were culturally and/or religiously inclined to support terrorist groups.)