At the simplest level, rank and file zionists don't know from imperialism. They support a homeland. Connected, but with a big difference.
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Edward Said stresses the importance of imperialist ideology in seeking the intellectual origins of Zionism. Anti-Jewish prejudice may have motivated Zionism, but the founders (all European) took the form, language, style, and philosophy of their movement from European imperialist ideology. Thus the non-European world was seen as backward, uncivilized, etc.
The essence of Zionism emerged before Herzl (the father of political zionism).