Why does the left wing hate Zionism?

IT DOES? But first, you have to define what you mean by "Zionism". The belief that Israel should exist and be a home for Jews? Or the extremist belief based on that old "a people without a land for a land without a people" BS which would advocate the expulsion of all but Jews from Israel? Or the way some people use "Zionism" to refer to the current right-wing, extremist party currently running Israel?