Colonialism certainly helped establish some settlements, but is colonialism essential for the survival of the kibbutz system? I don’t think so.
For example, if a kibbutz was initiated (legally and paid for) in Australia, then colonialism would not be an ingredient.
But you nonetheless used a Colonialist system as an example.
I disagree. The ideology of a kibbutz is not Colonialist.
The example was colonialist. It has only existed in a colonialist form. You were tasked with providing an example of Socialism working, which by extension implies you believe colonialism to be compatible with Socialism. This is nonsense.
It has only existed in a colonialist form.
There are examples of kibbutzs outside of Israel. Colonialism is not (necessarily) part of the ideology.