It’s allowed to exist cause their aims are foldable into usa goals, not the other way around. They became zionists just as entity became usa ally, it’s not 100-1000 year old project. Put it another way, if they, for some reason, would desire destruction of saudis or japanese, their aspirations won’t go anywhere
Be more materialistic about ideologies, porkies shop around and amplify something which fits their goals, so if say pope is a jp2, spreading christianity is a priority, if it’s francis - not so much, if christianity is about austere consumption - no, if it’s about supply side jesus - yes.