They believe what the State Dept and mass western bourgeois press tells them to believe. The press told them China doing a genocide is a fact, State Dept agreed, they believe it. Those two reject the reality of Palestinian suffering, highlight only zionist propaganda messaging and this is the result. These people aren't seeing those pictures or don't consider them reliable because the "authoritative people" haven't made the call for it so it's all just Russian disinfo psyops or whatever.

Rejecting the truthfulness of those two institutions would require changing their worldviews and then they wouldn't be liberals. There's also something to be said for white supremacy. Casting Asians as barbaric, brutal, hordes is easy and doesn't dispute the white supremacist narrative. Casting white coded zionist settlers as bad would disrupt the narrative, better to continue to code brown Muslim people as barbaric hordes just like those Asiatic types out to destroy the "garden" of white civilization.