Hitler was appointed as Chancellor and was never elected to that position. In fact his party never won an election where he assumed the leadership of Germany. 

Had the Arabs won the war in 1948 and taken charge, the human cost would have been far worse given
the age-old Arab antipathy towards Jews. Furthermore, the country would have become an economic basket case as the Palestinian Arabs had no track record of success in economic matters. The US and the West know this full well which accounts for Israel's ongoing support by the West and the US.