Hell no they didn't. Hitler and crew didn't need any help massacring everything that moved, and they were backed by German moneyed interests (you know, the people that stood to gain from his rule), not a worldwide Jewish conspiracy. In the first place, WWII didn't contribute nearly as much as you'd expect to the creation of Israel; if anything it made the British acquiesce to Palestinian demands to secure their support. WWII was the culmination of European great power politics; besides, interwar Poland was one of Zionists' most important patrons, and its loss almost destroyed the whole project.