Teh best article I ever read about this was by Daniel Finkelstein in The Times. As it is behind a pay wall, I will quote from it:
"...what happened to my grandmother shows the dangers of Mans inhumanity to Man and the need to avoid it. But that is not the only lesson it teaches. And not the only lesson Jews have learnt.
When the Nazis invaded Holland, and arrested my family in their home, and stole their property, and killed their friends, and destroyed their community, and put them on trains to go to death camps, they were able to do it because they had the army and the soldiers and the guns. They were able to do it because the Jews were defenceless. They were able to do it because speeches and books and ideas about liberty, for all their great truth and power, werent enough.
How could the Jews not have learnt that lesson? How could they not have learned it... when they went home to the East of Europe and found they couldnt live in their houses or reclaim their property or be safe with their neighbours? How could they not have learnt it sailing round and round the harbour because no country wanted to take them?
The Jews have learnt the same lesson as everyone else about humanity and compassion, and been as good and as fallible as anyone else when trying to show it. But we have also understood a harder, harsher truth. That we cannot rely on others to keep us safe. And Israel exists precisely because of this."