I initially thought that they have been stopped from entering by the Greek authorities but it seems the ship itself made a call to move on. The protest itself was peaceful with no violence reported.
Have mixed thoughts about this one: I don’t really like people protesting at people who ultimately can’t do anything about the situation. On the other hand making life uncomfortable for Israeli tourists inadvertently puts pressure on the Israeli government.
https://www.theguardian.com/world/2025/jul/22/israeli-cruise-rerouted-after-aegean-islanders-protest-gaza-war