Zionism will only cease being demonized in the politically correct corners of the West once our schools and film industry cease to demonize colonialism. The politically correct depiction of the colonialist as a racist and covetous brute must give space to the majority of well-meaning administrators that helped build roads, schools, and hospitals for the natives.
It must be shown that colonialists administered law and justice far more fairly than most pre-colonial chieftains or post-colonial despots. It must be taught that human development indicators plummeted in the majority of African and Asian countries following independence.
Once an honest discussion about colonialism is tabled, hostility to Zionism will wane in leftist circles. Not because they will shed the belief that Zionism is a form of colonialism, but because it will be possible for them to appreciate the merits of Zionism.
Personally, I never thought of Zionism in such a way. I always viewed Zionism as merely supporting the state of Israel. However, it is scary that a large segment of Israeli society views Zionism as a movement to impose their will on another people. This is not your grandpappy's Israel.