Zionism says 'we, as a people, would like to live here. We'll buy it if you're selling'. Anti-Zionism says 'we should drive all Israelis out of Israel.' One of these is harmless. The other is attempted genocide. Fortunately, Zionism has pretty much won, but some people instinctively root for an underdog, which anti-Zionism is nowadays (thankfully).
But the people of Palestine decided that they did not want to sell...
In theory, Zionism is no better than White Supremacist’s views. But in practice, the anti Zionist (or the Arab ones at least) have proven themselves to be just as destructive and violent. I sometimes wish that the Israelis would go to Europe and the Palestinians to Jordan and that the whole of Israel/Palestine, from Gaza to Golan (with the exception of Jerusalem) just sank under the sea and became a bay for Jordan. A lot of problems would be solved in that case…