Christians are still very much persecuted across much of the Arab world.

Yes, and a big reason for that is because of Western and Zionist policies.

However they flee to the many safe Christian majority countries available to them rather than needing to establish a state of their own.

Doesn't justify ethnic cleansing. Nothing justifies ethnic cleansing. The only reason Zionism got powerful was because of England (Arthur Balfour to be specific). Many people with Zionist orientations believe that establishing a solely Jewish state is necessary for the liberation of Jews, but no true liberation movement involves ethnic cleansing, because this inspires hate on all sides.

England should have focused on combatting anti-semitism inside Europe, rather than just exporting all the European Jews to some other part of the world.