Earlier quoted context omitted.
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“Should we be unable to find a way to honest cooperation and honest pacts with the Arabs, then we have learned absolutely nothing during our 2,000 years of suffering.” Einstein in his letter to Zionist leader Chaim Weizmann, Nov. 25, 1929, AEA (Albert Einstein Archives) 33-411. He's not alone in this sentiment. Other prominent Jews like Hannah Arendt were anti-Zionist too.
Einstein's vision was not followed and his fame as a Nobel prize winner doesn't automatically mean he had the best answer.
If only everyone were kind-hearted and well-meaning and acted in good faith and etc, then maybe we wouldn't need religion or government. That, however, is not the world we live in and being too "nice" can mean you just enable the bad behavior of people less nice than you.