Cognitive dissonance.

Plus the east west thing.

Zionism is a western construct and western Christians, caught in the industrial evangelical complex of 'American Gospel', feel greater affinity and loyalty to it than to their Palestinian brothers in Christ.

Christian Zionism grows out of a distorted and somewhat bogus theological school of thought called Dispensationalism, which ends up framing the modern Jew as equivalent to the Christian... while inverting the emphasis on the covenants so that we obsess over land rights rather than anticipate the new creation that comes after the present one is burned up.

Then take a pinch of American exceptionalism and conflate that with the idea of blessing Abraham so you can be blessed, and you get the whole we stand with Israel popular sentiment from nationalists who think this is the way they support Murica.

And that's just trying to get western Christians to accept that Palestinian Christians might actually be a thing.

Now add that the majority of Palestinians who didn't (or couldn't) migrate are dependent on Hamas or equivalent radical islamic pushback to Zionism... so that the images of suffering, while human at one level, are made 'other' by the hijabs, the beards, the angry Allahu Akbar chanting... and the alienation from Western Christians is complete.

This one goes deep...