Israel's founding was in a time period during which Marxist / Socialist ideals were very popular in Europe.
The greatest number of European Jews willing to give up everything and risk life and limb in the founding of a Jewish State were those "at the bottom of the social heap", who due to their life circumstances found the ideals of communal life and socialism offered them equality, fairness, and a dignity in manual labor and agricultural life.
Add to that the fact that the vast majority of the "Pioneers" were young people motivated (as are most all youth) by idealistic thinking which thought that "a better and more fair society" could be structured in which there would no longer be poverty and destitution.
Today's Israelis have long moved past the social ideals of the founding Pioneers. Even so, they were raised by parents steeped in a mindset quite similar to the wagon trains which transported settlers from the East coast to the new Wild American West. When danger threatened, they circled the wagons, because a group working to defend and protect a community has a much better chance at success than does one or two individuals who opt to "go it alone" at the expense of the rest of their community.
Think of it this way:
Twenty people land on a desert island inhabited by cannibals. They have some guns and little food. Which holds the best chance for success? The group which shares the food and hands out the guns and unites to survive?...Or...One in the group claims his share is more important than the others, wants to sell the guns and sell the food to his companions, and then launches out solo in hopes of bribing the cannibals to eat only the other people but not him?
Those who believe only capitalism and free enterprise should be the order of the day on the deserted island are qualified to win "My self-centered greed and ignorance got myself and my companions all killed and eated by cannibals" award.
As a bonus prize, your headstone will read "He was savaged and eaten, but he at least had more food and guns when he died than the others who were savaged and eaten."