Israel braking the blockade.

The main if not the only aim of "freedom flotilla" is highly symbolic - to demonstrate that the "whole world" is against Israel. The international character of it was to serve exactly  that purpose. The fact that Greece stood on the side of Israel, not just created a hindrance in the execution of the action. It undermined the moral justification of it. If everyone against one, one can't be right. But if somebody else joins the one, the strength of universality of the moral judgment becomes just one of the possible opinions.  Thus "freedom flotilla" "peace activists" were lowered in their status from being messengers of god to left wing nuts, freaks and trouble makers who they really are. Thank you Greece.